Name: Mary Berry Death By Chocolate Cake Recipe
Prep time: 45 min
Cook time: 25 min
Total time: 1 h 30 min
Ingredients: 200g self-raising flour; 30g cocoa powder, sifted; 1 tsp baking powder; 200g caster sugar; 175g unsalted butter, softened; 3 large eggs, at room temperature; 100g dark chocolate (70% cocoa solids), melted and cooled; 3 tbsp whole milk; 1 tsp vanilla extract; 150g dark chocolate, finely chopped; 150ml double cream; 200g unsalted butter, softened; 350g icing sugar, sifted; 40g cocoa powder, sifted; 3 tbsp whole milk; 75g dark chocolate, melted and cooled; 50g dark chocolate, grated or shaved; a handful of chocolate curls or truffles (optional)

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This Mary Berry Death By Chocolate Cake is a towering, deeply fudgy sponge layered with glossy ganache and a velvety chocolate buttercream that holds its shape right to the edge of every slice. The crumb is tender and moist, with a dark cocoa richness that lingers on the palate without tipping into bitterness. This is the kind of centrepiece cake that suits both a birthday celebration and a quiet weekend bake in equal measure. It is reliable to make, even for those who do not bake chocolate cakes often. From start to finish, it is ready in around 1 hour 30 minutes.

What sets this version apart is the combination of cocoa powder and melted dark chocolate in the sponge, which gives a double-layered depth of flavour. The ganache sets to a smooth, slightly firm finish that slices cleanly, while the buttercream provides enough sweetness to balance the bittersweet chocolate layers.

Ingredients

For the Sponge

200g self-raising flour
30g cocoa powder, sifted
1 tsp baking powder
200g caster sugar
175g unsalted butter, softened
3 large eggs, at room temperature
100g dark chocolate (70% cocoa solids), melted and cooled
3 tbsp whole milk
1 tsp vanilla extract

For the Chocolate Ganache

150g dark chocolate, finely chopped
150ml double cream

For the Chocolate Buttercream

200g unsalted butter, softened
350g icing sugar, sifted
40g cocoa powder, sifted
3 tbsp whole milk
75g dark chocolate, melted and cooled

To Finish

50g dark chocolate, grated or shaved
A handful of chocolate curls or truffles (optional)

How to Make Mary Berry Death By Chocolate Cake

Prepare the tins: Grease and line two 20cm round sandwich tins with baking parchment. Preheat the oven to 180C (160C fan, Gas 4) and place a shelf in the centre position.
Melt the chocolate: Break the dark chocolate for the sponge into a heatproof bowl and set it over a pan of barely simmering water, making sure the base of the bowl does not touch the water. Stir occasionally until completely smooth, then remove from the heat and leave to cool for 10 minutes. This resting time is important, as hot chocolate added directly to the batter can cause the butter to split.
Cream the butter and sugar: Beat the softened butter and caster sugar together in a large bowl using a hand-held electric mixer or a stand mixer fitted with a paddle attachment. Mix on medium speed for 3 to 4 minutes until the mixture is pale and noticeably lighter in texture.
Add the eggs: Add the eggs one at a time, beating well after each addition. If the mixture starts to look curdled, add a tablespoon of the measured flour before continuing with the next egg.
Combine the dry ingredients: Sift the flour, cocoa powder, and baking powder into the creamed mixture. Fold gently using a large metal spoon or spatula, using slow figure-of-eight movements to keep as much air in the batter as possible.
Finish the batter: Add the cooled melted chocolate, milk, and vanilla extract. Fold until the batter is uniform in colour with no streaks of flour visible. The mixture should fall from the spoon in slow, thick ribbons.
Bake the sponges: Divide the batter evenly between the two prepared tins and smooth the tops with the back of the spoon. Bake for 22 to 25 minutes, until the sponges are risen and a skewer inserted into the centre comes out clean. Leave in the tins for 5 minutes before turning out onto a wire rack to cool completely.
Make the ganache: Place the finely chopped dark chocolate in a heatproof bowl. Heat the double cream in a small saucepan over medium heat until it just begins to bubble at the edges, then pour it over the chocolate. Leave for 2 minutes without stirring, then mix from the centre outwards until glossy and smooth. Set aside at room temperature to thicken to a spreadable consistency, around 30 to 40 minutes.
Make the buttercream: Beat the softened butter in a bowl until very pale, around 3 minutes. Add the sifted icing sugar and cocoa powder in two batches, mixing on low speed first to avoid a cloud of sugar, then increasing to medium. Add the milk and the cooled melted chocolate and beat for a further 2 minutes until the buttercream is silky and holds a soft peak.
Assemble the cake: Place one sponge on a cake board or serving plate. Spread half the buttercream over the surface in an even layer, then spoon half the ganache over the top and allow it to settle slightly. Place the second sponge on top and press down gently. Spread the remaining buttercream across the top and sides. Drizzle or spoon the remaining ganache over the top, letting it drip over the edges. Finish with grated chocolate or curls.

Tips for the Best Death By Chocolate Cake

Why is my chocolate sponge dense rather than light?

Over-mixing after the flour is added develops the gluten in the flour and knocks out the air beaten into the butter and sugar. Fold with a gentle hand and stop as soon as no dry pockets of flour remain.

Why did my ganache turn grainy rather than smooth?

Grainy ganache usually means the cream was too hot when poured, or the mixture was stirred too vigorously before the chocolate had melted. Allow the cream to cool for a minute after removing from the heat, then stir in slow, steady circles from the centre outward.

How do I stop the buttercream from looking greasy or split?

A greasy buttercream often results from butter that is too warm. If the mixture looks oily, chill the bowl in the fridge for 10 minutes then beat again on medium speed until it comes back together.

Why does my cake look sunken in the centre after baking?

Opening the oven door in the first 15 minutes causes a sudden drop in temperature that collapses the rising sponge. Resist checking the cake until the minimum bake time has passed and it smells cooked through.

Why is the ganache not setting firmly enough to spread?

If the ganache is still too liquid after 40 minutes at room temperature, place it in the fridge for 10 to 15 minute intervals, stirring between each, until it reaches a thick, spreadable consistency similar to soft peanut butter.

Serving Suggestions

Serve at room temperature with a generous pour of single cream to cut through the richness of the ganache.
Pair each slice with a strong cup of Assam or Darjeeling tea, which balances the dark chocolate without competing with its flavour.
Add a scoop of vanilla bean ice cream alongside a warm slice for a dinner party dessert.
Dust lightly with cocoa powder just before bringing to the table for a clean, professional finish.
Arrange a ring of fresh raspberries around the top edge for a tart contrast against the bittersweet chocolate layers.

Storage

Room Temperature

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

Refrigerator

Keep the cake in an airtight container in the fridge for up to 5 days. Remove it from the fridge at least 45 minutes before serving, as the buttercream firms considerably when chilled and the sponge texture is far better at room temperature.

Freezing

Wrap individual slices or the whole undecorated sponge layers tightly in cling film, then in a layer of foil, and freeze for up to 2 months. Defrost overnight in the fridge, then bring to room temperature before filling and decorating.

Nutrition

Calories: 620 kcal
Carbohydrates: 68g
Protein: 6g
Fat: 36g
Saturated Fat: 21g
Sodium: 180mg

Nutrition values are estimates based on typical ingredient brands and a standard serving size of one-tenth of the finished cake. Actual values may differ depending on the specific products used.

FAQs

Can I use milk chocolate instead of dark chocolate in this recipe?

You can swap the dark chocolate for milk chocolate, but the result will be noticeably sweeter and the flavour much less intense. If using milk chocolate, reduce the caster sugar in the sponge by 25g to keep the overall sweetness balanced.

Can I make this cake a day ahead of time?

Yes, and in fact the flavours develop well overnight. Assemble the fully decorated cake, cover it loosely, and keep it in a cool room or the fridge. Bring it to room temperature for at least 45 minutes before slicing and serving.

What size sandwich tins work best for this recipe?

Two 20cm round sandwich tins give the best result, producing layers that are deep enough to hold the fillings without the cake looking flat. Using 18cm tins will produce slightly thicker, dome-shaped sponges that may need a little longer in the oven.

Can I make this into a three-layer cake?

Divide the same batter between three 18cm tins instead of two 20cm tins to create three thinner layers. Reduce the baking time to around 18 to 20 minutes and check with a skewer as usual. Scale up the buttercream and ganache quantities by half to ensure there is enough for three layers of filling.

Is there a way to make this recipe gluten-free?

Swap the self-raising flour for a good-quality gluten-free self-raising flour blend that contains xanthan gum. The texture will be slightly more dense and may benefit from an extra tablespoon of milk to loosen the batter. Check all other ingredients, particularly the baking powder, carry a gluten-free certification.

Conclusion

The Mary Berry Death By Chocolate Cake is a rich, layered celebration cake that delivers a deep, bittersweet cocoa flavour in every component, from the tender double-chocolate sponge to the silky buttercream and glossy ganache finish. The steps are straightforward and the results are consistent, making this a reliable choice whether it is the first time baking a layered chocolate cake or the tenth. This recipe yields 10 generous slices, making it well suited to a gathering, birthday, or any occasion that calls for something truly impressive on the table.

Give this recipe a go and let us know how it turned out in the comments below. If the ganache finish was a first attempt, share a photo too. For another comforting bake with bold, warming flavour, try the Mary Berry Vegetable Curry Recipe, which is just as satisfying and equally straightforward to make at home.