Name: Mary Berry Coffee And Walnut Cake Recipe
Prep time: 25 min
Cook time: 25 min
Total time: 1 h 15 min
Ingredients: 225g unsalted butter, softened; 225g caster sugar; 4 large eggs; 225g self-raising flour, sifted; 1 tsp baking powder; 2 tbsp instant coffee granules, dissolved in 2 tbsp boiling water, cooled; 100g walnuts, roughly chopped; 175g unsalted butter, softened (for buttercream); 350g icing sugar, sifted (for buttercream); 2 tsp instant coffee granules, dissolved in 1 tbsp boiling water, cooled (for buttercream); 1 to 2 tbsp whole milk, if needed (for buttercream); 8 to 10 walnut halves, for decoration; 1 tsp instant coffee granules, dissolved in 1 tsp boiling water, cooled (optional drizzle)

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This Mary Berry coffee and walnut cake recipe produces a tender, golden sponge with a deep, roasted coffee note running through every layer, balanced by the faint bitterness of chopped walnuts. The crumb is open and yielding, and the coffee buttercream finishes each slice with a smooth, silky coat that holds its shape cleanly.

It is a reliable bake that works equally well for a weekend afternoon tea or a casual celebration table, delivering consistent results without fuss. The method is clear and beginner-friendly, with each stage building logically on the last. From start to finish, it is ready in around 1 hour 15 minutes.

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Ingredients

For the Sponge

225g unsalted butter, softened
225g caster sugar
4 large eggs
225g self-raising flour, sifted
1 tsp baking powder
2 tbsp instant coffee granules, dissolved in 2 tbsp boiling water, cooled
100g walnuts, roughly chopped

For the Coffee Buttercream

175g unsalted butter, softened
350g icing sugar, sifted
2 tsp instant coffee granules, dissolved in 1 tbsp boiling water, cooled
1 to 2 tbsp whole milk, if needed to adjust consistency

To Finish

8 to 10 walnut halves, for decoration
1 tsp instant coffee granules, dissolved in 1 tsp boiling water, cooled (optional drizzle)

How to Make Mary Berry Coffee And Walnut Cake

Prepare the tins and oven:

Preheat the oven to 180°C/160°C fan/Gas 4. Grease two 20cm round sandwich tins and line the bases with baking parchment. Positioning both tins side by side on the middle shelf ensures even heat from all sides.

Dissolve the coffee:

Measure the instant coffee granules into a small bowl and pour over the boiling water. Stir until completely dissolved, then leave to cool to room temperature before using, as adding hot liquid to the batter can cause the mixture to curdle unevenly.

Cream the butter and sugar:

Beat the softened butter and caster sugar in a large bowl using an electric hand whisk for 3 to 4 minutes until the mixture is very pale, noticeably increased in volume, and fluffy throughout. This stage is where the light, open crumb of the sponge is built, so do not rush it.

Add the eggs:

Beat in the eggs one at a time, adding a tablespoon of the sifted flour with each egg to prevent the mixture from splitting. If the batter looks slightly separated at any point, a little extra flour stirred through will bring it back together cleanly before the next egg goes in.

Fold in the flour and flavourings:

Sift the remaining flour and baking powder into the bowl and fold through using a large metal spoon or wide spatula. Once combined, stir in the cooled coffee liquid and the chopped walnuts until evenly distributed. Work gently at this stage, as overmixing after the flour is added tightens the crumb and results in a denser sponge.

Divide and level the batter:

Divide the batter evenly between the two prepared tins. Level each surface with a palette knife or the back of a spoon so both layers bake to an even depth, which makes filling and stacking the cake much easier later.

Bake the sponges:

Place the tins on the middle shelf and bake for 22 to 25 minutes. The sponges are ready when they are golden brown, have pulled away slightly from the edges of the tins, and a skewer inserted into the centre comes out clean with no wet batter attached.

Cool completely:

Leave the sponges in their tins for 5 minutes, then turn out onto a wire rack, peel away the parchment, and leave to cool fully. Applying buttercream to a warm sponge causes it to slide and melt, so allow at least 45 minutes of cooling time before assembling.

Make the coffee buttercream:

Beat the softened butter in a large bowl until smooth and creamy. Add the sifted icing sugar in three or four additions, beating thoroughly between each one. Stir in the cooled dissolved coffee and continue to beat until the buttercream is silky and pale. Add a splash of milk only if the mixture feels stiff and difficult to spread.

Fill, frost, and decorate:

Place one cooled sponge on a flat serving plate and spread roughly half the buttercream across the surface. Set the second sponge on top and spread the remaining buttercream in a smooth, even layer. Arrange the walnut halves in an evenly spaced ring around the top edge, then leave the finished cake to settle for 15 minutes before slicing.

Tips for the Best Mary Berry Coffee And Walnut Cake

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

A sunken centre is almost always caused by opening the oven door before the sponge has set, by underbaking, or by too much raising agent, which causes a fast rise that then collapses. Check the cake at 22 minutes using the skewer test rather than relying on timing alone, and avoid opening the oven before that point.

02 Why is my sponge dense and heavy rather than light and open?

Insufficient creaming of the butter and sugar is the most common cause. The mixture needs a full 3 to 4 minutes with an electric whisk to incorporate enough air for a light crumb. Also check that the baking powder is fresh, as it loses its potency quickly once a container has been opened, and stale raising agent gives a flat, tight result.

03 Why does the coffee flavour taste weak in the finished cake?

The strength of the coffee flavour depends on the concentration of the dissolved granule mix. Dissolving 2 tablespoons of granules in 1 to 1.5 tablespoons of water rather than 2 tablespoons gives a stronger concentrate that carries more flavour through the bake. Apply the same principle to the buttercream for a consistent coffee note throughout.

04 How do I stop the buttercream from turning out greasy and separated?

Greasy buttercream is almost always caused by butter that is too warm rather than properly softened. The butter should be pliable but still cool to the touch, not shiny or soft at the edges. If the buttercream splits, place the entire bowl in the fridge for 10 minutes and then beat again from scratch, which usually pulls it back together.

05 How do I get a smooth, even finish on top of the buttercream?

Use a palette knife dipped briefly in hot water and dried before each pass. The warmth allows the knife to glide cleanly through the buttercream without dragging or pulling. Work in one direction across the surface rather than back and forth, and smooth the outer edge last once the centre is level.

Serving Suggestions

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Serve at room temperature alongside a pot of strong Assam or Darjeeling tea for a classic British afternoon spread.

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Pair each slice with a small cup of freshly brewed espresso or filter coffee to echo the roasted notes in the sponge.

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Dust lightly with a pinch of finely ground coffee powder directly before serving for an extra aromatic, visual finish.

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Arrange on a tiered cake stand for a celebration or birthday table, sliced into thinner portions for easy serving.

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Spoon a small amount of lightly whipped double cream alongside each slice to cut through the richness of the coffee buttercream.

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Storage

Up to 2 Days

Room Temperature

Store the assembled cake in an airtight container at cool room temperature for up to 2 days.

Up to 5 Days

Refrigerator

Keep the cake in an airtight container in the fridge for up to 5 days. Allow it to sit at room temperature for at least 30 to 45 minutes before serving, as chilled buttercream can taste dense and the sponge loses its soft texture straight from the fridge.

Up to 3 Months

Freezing

Wrap individual, unfrosted sponge layers tightly in clingfilm and then in foil before freezing for up to 3 months. Defrost fully at room temperature before filling and frosting, which gives the best crumb texture once assembled.

Nutrition

Calories

520

kcal per serving

58g

Carbohydrates

Protein

29g

Fat

15g

Saturated Fat

210mg

Sodium

Nutrition values are estimates based on standard ingredient weights and may vary depending on the specific brands used and the size of each serving.

FAQs

01 Can I use espresso instead of instant coffee granules in this recipe?

Yes, a cooled double shot of espresso (around 50ml) works well in place of the dissolved instant coffee in the sponge. For the buttercream, reduce any added milk accordingly so the consistency stays correct and the buttercream holds its shape.

02 Can I make this coffee and walnut cake a day ahead?

The sponge layers bake well a day in advance. Once cooled, wrap them tightly in clingfilm and store at room temperature overnight. Make and apply the coffee buttercream on the day of serving for the freshest texture and finish.

03 Can I replace the walnuts with a different nut?

Pecans are the most natural alternative and work very well, offering a slightly sweeter, less bitter flavour that complements the coffee well. Avoid very hard nuts such as whole almonds, as they do not integrate well with the soft, yielding crumb of the sponge.

04 What size tins work best for this coffee and walnut cake?

Two 20cm round sandwich tins give the best balance of depth and layer proportion for this quantity of batter. Using 18cm tins will produce deeper sponges with a longer baking time, while 23cm tins will give thinner layers that bake slightly faster. Adjust the baking time accordingly and rely on the skewer test rather than timing alone.

05 Can I bake this recipe as a traybake instead of a sandwich cake?

The batter transfers well to a lined 30cm x 20cm rectangular tin at the same oven temperature. Bake for 25 to 30 minutes, then check with a skewer. Once cooled, spread the coffee buttercream over the surface and decorate with walnut halves before cutting into squares for a more casual, easy-to-serve presentation.

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Conclusion

This Mary Berry coffee and walnut cake recipe brings together a tender, flavour-rich sponge and a silky coffee buttercream in a way that is straightforward for beginners and satisfying for more experienced bakers. The recipe yields 10 to 12 generous slices, making it an ideal size for sharing at a gathering or keeping through the week. The balance between the roasted coffee note and the slightly bitter walnut is what gives each slice depth rather than one-note sweetness.

Whether the occasion calls for a celebration cake or a simple weekend bake, this recipe delivers clean, consistent results every time. If it goes down well, leave a comment below to share how it turned out and feel free to pass it on to anyone who enjoys a classic British sponge. If you enjoyed this, you might also like the mary berry lemon drizzle tray bake recipe for another reliable, crowd-pleasing bake.