Mary Berry Coffee & Walnut Cake: Recipe, Tips & Troubleshooting

Key Takeaways

Mary Berry’s coffee and walnut cake uses her signature all-in-one method: everything goes in one bowl
The classic sandwich cake bakes in 20-25 minutes; the traybake version takes 35-40 minutes and feeds a crowd
Toasting your walnuts first makes the single biggest difference to flavour
Common problems like a sunken middle or split buttercream are easy to fix once you know the cause
You can make it with instant coffee or traditional Camp Coffee essence, both are authentically Mary Berry

Recipe At a Glance

Prep Time: 15 minutes
Bake Time: 20-25 minutes (sandwich cake) or 35-40 minutes (traybake)
Total Time: 45 minutes to 1 hour
Servings: 10-12 slices
Difficulty: Easy, perfect for beginners
Make Ahead: Yes, sponges keep 4 days wrapped, or freeze for 3 months
Best For: Afternoon tea, birthdays, bake sales, impressing the in-laws

If you’ve ever wandered into a proper British tea room and not spotted a coffee and walnut cake sitting proudly on the stand, did it even count? This is one of Britain’s most beloved bakes, and Mary Berry’s version is the one I keep coming back to. Every. Single. Time.

Living in London with three kids (14, 13, and 8, and yes, they eat like locusts), I need cakes that are straightforward but impressive enough to serve when friends pop round. This one ticks every single box. I’ll be honest with you, I used to be intimidated by this cake. It feels fancy, doesn’t it? Like something your gran would whip up effortlessly whilst simultaneously doing the crossword and listening to Radio 4. But here’s the thing: Mary Berry’s version is absolutely brilliant because it’s stupidly simple. No faff, no fancy equipment, just proper, delicious cake that makes you look like a domestic goddess.

Mary Berry Coffee and Walnut Cake

A classic British coffee and walnut cake using Mary Berry's brilliant all-in-one method. Light, fluffy sponge with a rich coffee buttercream, ready in under an hour.

Print Recipe

Prep Time 15

Cook Time 25

Total Time 50

Course: cake, Dessert

Cuisine: British

Ingredients Method Notes

Ingredients

For the Sponge:
200 g self-raising flour
200 g caster sugar
200 g very soft unsalted butter
4 large eggs at room temperature
1 teaspoon baking powder
2 tablespoons strong instant coffee dissolved in 1 tablespoon boiling water cooled completely
50 g walnuts finely chopped
For the Coffee Buttercream:
200 g very soft unsalted butter
400 g icing sugar sifted
2 teaspoons instant coffee dissolved in 1 tablespoon boiling water cooled completely
2-4 teaspoons milk
Walnut halves for decoration

Method

Preheat your oven to 180°C (160°C fan)/350°F/Gas Mark 4. Grease two 20cm round cake tins and line the bases with baking parchment.
Dissolve your instant coffee in boiling water and set aside to cool completely.
Add all sponge ingredients except the walnuts to a large bowl. Beat with an electric hand whisk on medium speed for 2-3 minutes until smooth and creamy.
Fold in the chopped walnuts with a spatula.
Divide the mixture evenly between the two tins and level the tops. Bake for 20-25 minutes until golden, shrunk from the sides, and springy to the touch. A skewer inserted in the centre should come out clean.
Leave in tins for 10 minutes, then turn out onto a wire rack and cool completely.
Beat the butter for the buttercream until smooth. Gradually add the sifted icing sugar, beating well between each addition. Add the cooled coffee mixture and beat until smooth. Add milk a teaspoon at a time until you reach a spreadable consistency.
Place the first sponge upside down on your serving plate. Spread one third of the buttercream over the top. Place the second sponge on top, also upside down. Spread the remaining buttercream over the top and sides.
Decorate with walnut halves and serve.

Notes

Toast your walnuts in a dry pan for 5 minutes before adding to the batter. It makes a remarkable difference to the flavour. For the traybake version, use a 30 x 23cm tin, increase to 225g each of butter, sugar and flour plus 5 eggs, and bake for 35-40 minutes.

What Makes This Cake So Special?

The combination of coffee and walnuts is pure magic. The slight bitterness from the coffee cuts through the sweetness of the buttercream perfectly, whilst the walnuts add this gorgeous crunch and earthiness. It’s sophisticated without being pretentious, comforting without being boring. And unlike some cakes that taste better on day one, this beauty actually improves slightly as the flavours meld together.

Plus, and this is crucial for busy parents, it uses Mary’s all-in-one method. Chuck everything in a bowl, whizz it with an electric hand mixer, and you’re done. No creaming butter for ages, no carefully folding in flour. Just simple, straightforward baking that actually works.

Traybake or Sandwich Cake – Which Should You Make?

Before you start, it is worth deciding which version suits your needs. Both use the same recipe base, but the format changes everything about how you serve and store it.

Factor	Sandwich Cake	Traybake
Best for	Afternoon tea, birthdays, dinner parties	Bake sales, picnics, feeding a crowd
Bake time	20-25 minutes	35-40 minutes
Portions	10-12 slices	20-24 squares
Transport	Needs cake carrier, slightly fiddly	Easy – stays in the tin
Wow factor	High – looks properly impressive	Moderate – more casual
Difficulty	Slightly trickier (assembly required)	Dead easy (ice and done)

My honest take? For family gatherings and showing off, go sandwich cake. For school bake sales or when you need to transport it anywhere, traybake every time. I have genuinely done both in the same week when life got hectic.

The Fascinating History Behind Coffee & Walnut Cake

Before we take a look at the recipe, can we just appreciate how very British this cake is? Whilst Americans think “coffee cake” and picture something with streusel topping (delicious, but totally different), we Brits have been making actual coffee-flavoured cakes since at least the 1930s.

The earliest recorded recipe for coffee and walnut cake appeared in a 1934 advertisement for McDougall’s self-raising flour. Food manufacturers back then were brilliant at creating recipes to sell their products (bit like how we all learned to make chocolate chip cookies from the back of chocolate chip packets, really). The cake quickly became a staple in British baking, appearing in tea rooms and home kitchens across the country.

Nigel Slater, the legendary British food writer, has famously said that coffee and walnut cake would be part of his ideal last meal. Now that’s proper endorsement, isn’t it? The cake even got its moment in the GBBO spotlight when Mary Berry challenged contestants to make a Battenberg version.

What I love about this cake’s history is that it represents a moment when coffee was becoming more mainstream in Britain (despite us being a nation of tea drinkers). It was sophisticated and modern, but still comforting and homely. That balance is probably why it’s endured for nearly a century.

Understanding Mary Berry’s Genius: The All-in-One Method

If you’ve never used Mary Berry’s all-in-one method, prepare to have your mind blown. Traditional cake making involves creaming butter and sugar for what feels like an eternity, carefully adding eggs one at a time, then gently folding in the flour. It’s fiddly and time-consuming.

Mary’s method? Bung everything in a bowl and beat it until smooth. That’s it.

The secret is using very soft butter (or baking spread straight from the fridge, which Mary actually prefers for traybakes) and an electric hand whisk. The high speed of the mixer incorporates air quickly, whilst the self-raising flour and baking powder provide the lift. It works because the ratios are spot-on.

I was sceptical the first time I tried it. Years of watching Bake Off had convinced me that proper baking required careful technique and finesse. But this method produces a light, fluffy sponge every single time. No curdling, no deflating, no drama.

Mary Berry Coffee & Walnut Cake: The Full Recipe

Equipment You’ll Need

2 x 20cm (8 inch) round cake tins with removable bases (or one 30 x 23cm traybake tin)
Electric hand whisk or stand mixer
Large mixing bowl
Weighing scales (seriously, buy digital ones if you haven’t already – they’re life-changing)
Cooling rack
Palette knife or offset spatula for icing
Baking parchment

For the Sponge

200g self-raising flour
200g caster sugar (or light muscovado for deeper flavour)
200g very soft unsalted butter
4 large eggs (at room temperature)
1 teaspoon baking powder
2 tablespoons strong instant coffee dissolved in 1 tablespoon boiling water (cooled)
50g walnuts, finely chopped

For the Coffee Buttercream

200g very soft unsalted butter
400g icing sugar, sifted
2 teaspoons instant coffee dissolved in 1 tablespoon boiling water (cooled)
2-4 teaspoons milk (to achieve spreading consistency)
Walnut halves for decoration (8-12, depending on how many slices you’re cutting)

Step-by-Step Method

Preparing Your Tins

Preheat your oven to 180°C (160°C fan)/350°F/Gas Mark 4. Grease your cake tins generously with butter, then line the bases with baking parchment. For the sides, I like to grease them and give them a light dusting of flour – tap out any excess. This double insurance means your cakes will turn out cleanly every time.

Top Tip: If you’re using a traybake tin (30 x 23cm), line the base and sides with one large piece of baking parchment with the corners snipped to fit neatly. So much easier than trying to piece it together.

Making the Coffee Solution

Dissolve your instant coffee in boiling water and set it aside to cool completely. This is important. If you add hot coffee to your butter and eggs, you risk curdling the mixture. I always do this step first, then get on with weighing everything else whilst it cools.

Which coffee to use: Mary Berry’s original traybake recipe (from the Baking Bible) uses Camp Coffee essence, or specifies instant coffee granules dissolved in water as an alternative. For the sandwich cake, most home bakers use strong instant coffee. I use Nescafé Alta Rica or any decent espresso-style instant. Cheap coffee will make your cake taste cheap. You want a bold, strong flavour that comes through in both the sponge and the buttercream. Camp Coffee gives a slightly gentler, more old-fashioned flavour and is the more traditional choice if you want to go full vintage.

The All-in-One Magic

Add all your sponge ingredients except the walnuts into a large mixing bowl: flour, sugar, butter, eggs, baking powder, and your cooled coffee. Using an electric hand whisk on medium speed, beat everything together for about 2-3 minutes until you have a smooth, well-combined batter.

The mixture should be light and creamy, dropping easily from a spoon. If it seems a bit stiff, add a tablespoon of milk to loosen it slightly. Fold in your chopped walnuts using a spatula.

Common mistake alert: Don’t overmix once you’ve added the walnuts. You just want to distribute them evenly. Thrashing the mixture at this point knocks out air and makes your cake dense.

Baking to Perfection

Divide your mixture evenly between your two prepared tins (or pour it all into your traybake tin). Level the tops with a spatula or the back of a spoon. For sandwich cakes, bake for 20-25 minutes. For traybakes, you’re looking at 35-40 minutes.

Your cake is done when it’s golden brown, has shrunk slightly from the sides of the tin, and springs back when gently pressed in the centre. A skewer inserted into the middle should come out clean or with just a few moist crumbs attached.

Temperature note: Every oven is different. My fan oven runs hot, so I always check my cakes 3-5 minutes before the recommended time. Get to know your oven’s quirks, it makes all the difference.

Leave the cakes in their tins for 10 minutes to settle, then turn them out onto a wire rack to cool completely. Do not attempt to ice warm cakes unless you want buttercream soup. Trust me on this.

Creating the Perfect Buttercream

Whilst your cakes are cooling, make your buttercream. Beat your soft butter in a large bowl until it’s smooth and creamy. Gradually add the sifted icing sugar (sifting is non-negotiable, lumpy icing is grim), beating well between each addition.

Once you’ve incorporated about three-quarters of the icing sugar, add your cooled coffee mixture. Beat until smooth, then add the remaining icing sugar and enough milk to achieve a spreadable consistency. You want it thick enough to hold its shape but soft enough to spread without tearing your sponge.

Flavour Check: Taste your buttercream (baker’s privilege). If you want a stronger coffee flavour, add a tiny bit more dissolved coffee. Go carefully though – too much liquid will make it runny.

Assembly and Decoration

Place your first sponge layer upside down on your serving plate (the flat base makes a better sandwiching surface). Spread about one-third of your buttercream evenly over the top. Place the second sponge on top, also upside down, so you have a lovely flat surface to ice.

Spread another third of the buttercream on top, using a palette knife to create a smooth finish. You can be rustic about this (I usually am), or aim for that professional smooth finish if you’re feeling fancy. Use the remaining buttercream to cover the sides if you like, or keep it simple with just the top iced.

Whilst the icing is still soft, decorate with walnut halves around the edge, one for each slice you plan to cut. Some people do elegant piped rosettes with a walnut on each. I just press them gently into the icing because I’m impatient and it still looks gorgeous.

Pro Tips From My Kitchen to Yours

Toast your walnuts first. Five minutes in a dry pan transforms the flavour completely. This is the single biggest upgrade you can make.
Weigh your eggs. Large eggs can vary wildly. For consistent results, crack them into a jug and aim for 200g total.
Use room temperature eggs. Cold eggs can make the batter seize slightly. Pop them in warm water for 5 minutes if you forgot to take them out.
Coffee cooling matters. Seriously, let it cool completely or your buttercream will be a melty disaster.
Level your cakes while warm. If they have domed tops, trim them with a serrated knife while still slightly warm – much easier than when cold.

Why Did My Cake Go Wrong? Troubleshooting Common Problems

My Cake Didn’t Rise and Looks Flat

This is the number one complaint I see in comments on recipe sites, and it’s usually down to a few culprits.

Expired raising agents: Check the date on your baking powder. If it’s been lurking in your cupboard since 2019, it’s dead. Buy fresh.

Not enough mixture for the tin size: Mary’s standard recipe makes enough for two 18cm (7 inch) tins. If you’re using 20cm (8 inch) tins like I do, you need to scale up by about 50%. Otherwise you’ll have thin, sad cakes.

Wrong flour: Self-raising flour is essential. Plain flour will give you dense pancakes, not fluffy sponge.

Overmixing: Once the walnuts are in, stop. You’ll knock out all the air.

My Cake Sinks in the Middle

A sunken middle usually means the cake wasn’t quite cooked through when you took it out. The outside sets first, so a cake can spring back to the touch and still be underdone in the centre. Always test with a skewer all the way to the centre, not just near the edge. An oven running too hot can also cause this, setting the outside quickly whilst the middle stays raw.

My Cake is Dry

The most common reason is overbaking. Check your cake 3-5 minutes before the recommended time, especially with a fan oven. As soon as a skewer comes out clean, get it out.

Also make sure you’re measuring accurately. Too much flour or not enough butter will give you a dry crumb. This is why digital scales are essential for baking.

My Buttercream Split or Looks Greasy

Your butter was too warm or not soft enough. Room temperature butter should hold a fingerprint but not be melting. If it’s too cold your icing will be lumpy. Too warm and it can’t emulsify properly.

If your buttercream has split, try adding a tablespoon of boiling water and beating vigorously. This usually brings it back together. If it’s irretrievably greasy, refrigerate it for 15 minutes, then re-beat.

The Cake is Too Sweet

British baking does tend towards the sweet side. If you find it cloying, try using less icing sugar in the buttercream (start with 300g instead of 400g), or use light muscovado sugar in the sponge instead of caster. The slight molasses flavour balances the sweetness beautifully.

Variations and Adaptations (Because Life’s Too Short to Be Boring)

Gluten-Free Version

Swap the self-raising flour for a good gluten-free self-raising blend. Doves Farm is reliable here. You might need an extra tablespoon of milk as gluten-free flour can be thirstier. Everything else stays the same.

Without Walnuts

If you’re feeding someone with a nut allergy, simply leave them out of the sponge and decorate with chocolate shavings or coffee beans instead. The cake will still be delicious.

Mary Berry Coffee and Walnut Traybake

Mary’s traybake version is brilliant for parties, bake sales, or any time you need to feed a crowd without the faff of assembling a layered cake. Use a 30 x 23cm tin, increase your ingredients slightly (225g each of butter, sugar, and flour, plus 5 eggs), and bake for 35-40 minutes. Ice the whole thing in one go and cut into 20-24 squares. The great advantage of the traybake is that it travels beautifully. Pop a sheet of baking parchment over the iced surface, secure the lid, and it’s ready to go.

Deeper Coffee Flavour

Want to take it to the next level? Use espresso powder instead of instant coffee, and add a tablespoon of coffee liqueur (Kahlúa or Tia Maria work well) to the buttercream. Not one for the school bake sale, obviously, but absolute heaven for an adult dinner party.

With Mascarpone

For a slightly less sweet version, replace half the butter in the buttercream with mascarpone. This gives you a tangier, lighter icing that’s absolutely gorgeous. Beat the mascarpone first to soften it, then beat in the butter, icing sugar, and coffee as usual.

Storage, Make-Ahead, and Freezing Tips

Once assembled and iced, keep your cake in an airtight container in a cool room. Avoid the fridge if possible, it makes the sponge go hard and changes the texture of the buttercream. In moderate temperatures, it’ll keep beautifully for 3-4 days.

Make ahead: Bake your sponges up to 4 days in advance. Once completely cool, wrap them tightly in cling film and store in an airtight container. Make the buttercream and assemble on the day you plan to serve.

Freezing: The sponges freeze brilliantly. Wrap individually in cling film, then foil, for up to 3 months. Defrost overnight at room temperature before icing. The assembled cake can also be frozen. Open-freeze it first until the icing is solid, then wrap carefully. Defrost in the fridge overnight, then bring to room temperature before serving.

Serving Suggestions

Traditional afternoon tea: Serve thin slices with a proper pot of tea. Add some cucumber sandwiches, scones with jam and cream, and you’ve got yourself a proper British afternoon tea spread. Wear your fanciest frock and pretend you’re at the Ritz.

Birthday cake alternative: This makes a brilliant alternative to traditional birthday cake. It’s sophisticated enough for adult birthdays but crowd-pleasing enough that kids will love it too. Add candles to the walnut decorations for an easy transformation.

Dinner party dessert: Serve slightly warmed (15 seconds in the microwave), with a scoop of vanilla ice cream or a dollop of lightly whipped cream. Dust with cocoa powder for extra fanciness. Your guests will think you’ve been to culinary school.

Coffee Time Treat: Pair with a proper cup of coffee (obviously) for elevenses or an afternoon pick-me-up. It’s also brilliant with a latte or cappuccino, the coffee flavours complement each other beautifully without being overwhelming.

The Spirited Puddle Jumper Verdict

Look, I’ll level with you – this cake is an absolute winner in our house. I’ve made it for birthday parties, taken it to school bake sales, served it when my in-laws visited, and demolished far too many slices whilst watching Netflix on the sofa. It never disappoints.

What I love most is that it’s straightforward enough for a Wednesday evening when you just fancy baking something nice, but impressive enough that people think you’ve really put in effort. The husband always makes appreciative noises, the kids actually eat it without complaining (rare), and I feel like a proper domestic goddess without having to learn complicated techniques.

The coffee and walnut combination is just gorgeous – sophisticated but comforting, sweet but not cloying. And Mary Berry’s all-in-one method means you can whip it up in less time than it takes to watch an episode of Bake Off.

My top tip? Toast the walnuts before adding them to the cake. Just five minutes in a dry pan transforms them from “nice” to “absolutely incredible”. The extra depth of flavour is worth the tiny bit of extra effort.

Whether you’re after a traditional afternoon tea treat, a birthday cake alternative, or just want something delicious to have with your morning coffee, this is the recipe you need in your life.

Frequently Asked Questions

Does Mary Berry use coffee essence or instant coffee in her coffee and walnut cake?

Mary Berry’s original Baking Bible traybake recipe uses Camp Coffee essence, with instant coffee granules dissolved in water given as an alternative. For the sandwich cake version, most home bakers (me included) use strong instant coffee. Both work beautifully. Camp Coffee gives a slightly gentler, more traditional flavour. Instant coffee tends to be bolder and more robust.

Can I use Camp Coffee in this recipe?

Yes, and it’s actually the more traditional approach. Use 1 tablespoon of Camp Coffee essence in the sponge and 1-2 teaspoons in the buttercream. The flavour is slightly more old-fashioned but absolutely delicious.

Why is my coffee and walnut cake bitter?

Too much coffee, or adding it whilst still hot. Stick to the measurements and always let your coffee mixture cool completely before adding it to the batter or buttercream.

Can I make this without walnuts?

Absolutely. Leave them out entirely or swap for pecans, hazelnuts, or chocolate chips. For nut allergies, decorate with chocolate shavings instead.

Why did my coffee and walnut cake sink in the middle?

Usually because it came out of the oven before the centre was fully cooked. The outside can spring back to the touch before the middle is done. Always test with a skewer all the way to the centre, not just near the edge. An oven running too hot can also cause this.

How long does coffee and walnut cake keep?

3-4 days in an airtight container at room temperature. Avoid the fridge if possible as it dries out the sponge. The uniced sponges freeze well for up to 3 months.

Can I make this as cupcakes?

Yes. Divide the batter between 18-20 cupcake cases and bake for 15-18 minutes. Top with a swirl of coffee buttercream and a walnut half.

Is it better to use butter or baking spread?

Butter gives the best flavour for a sandwich cake. Baking spread works brilliantly for traybakes as it’s softer straight from the fridge. Either will work, just make sure your butter is very soft before you start.

Pin this recipe for later!

Have you tried Mary Berry’s Coffee & Walnut Cake? What did you think? Share your tips and tricks in the comments below!

Liked this Mary Berry Recipe? Explore my takes on other recipes from the queen of cooking and baking!

Mary Berry Victoria Sponge with Buttercream

Mary Berry Swiss Roll

Mary Berry Treacle Tart

Mary Berry Raspberry Jam

Mary Berry Buttercream

Mary Berry Ginger Cake

Mary Berry Blueberry Muffins

Mary Berry Sausage Rolls

Mary Berry Marmalade

Mary Berry Cheese Scones

Mary Berry Roast Potatoes with Semolina

Mary Berry Chocolate Swiss Roll

Mary Berry Apple Pie

Mary Berry Drop Scones

Mary Berry Chocolate Brownies

Mary Berry Rice Pudding

Mary Berry Yorkshire Puddings

Mary Berry Apple Cake

Mary Berry Lemon Drizzle Tray Bake

Mary Berry No Bake Cheesecake

Mary Berry Sticky Toffee Pudding

Mary Berry Carrot Cake

Mary Berry Rhubarb Cake

Mary Berry Macaroni Cheese

Mary Berry Pavlova

Mary Berry Fork Biscuits

Mary Berry Banana Bread

Browse my full Mary Berry recipe collection here!

Becky

Meet the award-nominated UK lifestyle blogger behind Spirited Puddle Jumper – a mum of three living in South East London! Becky shares the real ups and downs of family life, parenting tips, and lifestyle inspiration, proving that being a mum doesn’t mean you stop being fun or having other interests! Follow along for honest insights into UK family life and opinions on a whole range of topics, from travel and food, to beauty reviews, home and DIY, business and health and wellness.

Baking Food