The chocolate sponge in this recipe is my new go to chocolate sponge now. It is everything you want a chocolate cake to be; chocolatey, rich, cakey, moreish, amazing. The coffee intensifies the chocolate flavour and the buttermilk adds a fudginess to the overall bake. Team that with a slathering of Oreo cookie, cream cheese icing and you’re onto a winner. This recipe makes enough for a massive 4 layer cake so feel free to half the amount if you don’t want something quite so extreme. I made the full amount but made two cakes – one to keep and one to take to work – the lucky devils!
For the chocolate sponges:
- 300ml vegetable oil, plus extra for greasing
- 400g plain flour
- 130g cocoa powder
- 4 tsp baking powder
- 2 tsp bicarbonate of soda
- 560g light brown soft sugar
- 400ml buttermilk
- 200ml strong coffee
- 4 tsp vanilla extract
- 4 large eggs
For the icing:
- 150g stork baking margarine
- 400g icing sugar
- 180g tub full-fat cream cheese
- 2 tsp vanilla extract
- 1 pack Oreo biscuits (I used chocolate stuffed Oreos)
- Heat oven to 180C/160C fan. Grease and line two 20cm cake tins with baking parchment – if your cake tins are quite shallow, line the sides to a depth of at least 5cm. Put 200g flour, 65g cocoa powder, 2 tsp baking powder, 1 tsp bicarbonate of soda, 280g light brown soft sugar and 1 tsp salt in a bowl and mix well. If there are any lumps in the sugar, squeeze these through your fingers to break them up.
- Measure 200ml buttermilk, 100ml coffee, 150ml oil and 2 tsp vanilla in a jug. Add 2 eggs and whisk until smooth. Pour the wet ingredients into the dry and whisk until well combined. Pour the cake mixture evenly into the two tins, and bake for 25-30 mins until risen and a skewer inserted into the centre comes out clean. Cool in the tins for 10 mins, then turn out onto a wire rack, peel off the baking parchment and leave to cool.
- Repeat steps 1 and 2, so that you have 4 sponge cakes in total. These sponges can be made up to three days ahead and will stay moist if wrapped in cling film, or you can wrap well and freeze for up to two months.
- To make the icing, put the butter in a large bowl and sieve in half the icing sugar. Roughly mash together with a spatula, then beat with a wooden spoon until smooth. Add the cream cheese and sieve in the remaining icing sugar, mash together again, then blend once more. Put the Oreos in a food processor and whizz to fine crumbs. Add the biscuit crumbs to the icing and mix again until combined.
- To assemble the cake, stick one of your sponges to a cake stand or board with a little of the cream cheese icing. Use roughly half the icing to stack the remaining cakes on top, spreading a generous amount between each layer. Pile the remaining icing on top of the assembled cake, and use a palette knife to ease it over the edges, covering the entire surface of the cake. Tidy the plate with a piece of kitchen paper.
- If you have any leftover Oreos, break them into pieces and push these around the base of the cake.Alternatively, use mini Oreos.
Someone’s lucky day!