The Mary Berry Chocolate Birthday Cake is a soft, light sponge made with cocoa powder and self-raising flour, sandwiched and topped with rich chocolate icing. It’s typically a two-layer round cake, perfect for birthdays and special occasions. With simple ingredients and straightforward steps, it’s a go-to recipe for both beginners and experienced bakers.
Preheat the oven to 180°C (160°C fan) or 350°F.
Grease and line two 20cm round cake tins with parchment paper.
In a large bowl, sift flour, cocoa powder, and baking powder.
Add caster sugar, softened butter, eggs, and milk.
Beat everything together using a hand mixer until smooth and well combined.
Divide the mixture evenly between the two tins and smooth the tops.
Bake for 20–25 minutes, or until the sponges are springy and a skewer comes out clean.
Cool in the tins for 5 minutes, then turn out onto a wire rack to cool completely.
Melt the chocolate and butter together in a heatproof bowl over a pan of simmering water (or use the microwave in short bursts).
Stir until smooth, then remove from heat.
Gradually beat in sifted icing sugar and hot water until you have a glossy, spreadable icing.
Place one cake layer on a plate or stand.
Spread some of the icing on top, then place the second sponge on top.
Cover the top and sides with the remaining chocolate icing.
Decorate as desired with sprinkles, fruit, or candles.