Preheat your oven to 160℃/320F fan, 180℃/350F.
Put 12 cupcake cases into your tin.
Cream your room temperature butter with your sugar until it's pale, light and fluffy, using a wooden spoon or an electric hand whisk.
Add all of the eggs and sift in the flour and cocoa powder and mix together until everything is well combined.
Spoon equal amounts of mixture into your cupcake cases. (I use an ice cream scoop as this gives the perfect amount and ensures some uniformity.)
Bake for about 15-18 minutes until the cakes are golden and slightly bouncy to the touch. Then leave them to cool on a cooling rack.
Now make the buttercream icing. Beat your butter until it's pale, light and fluffy then beat in the icing sugar.
Mix the cocoa powder with 1-2 tbsp boiling water, just enough to make a thick smooth paste. Then mix this into the butter and icing sugar.
You want your icing to be most soft, fluffy and pipeable so add a teaspoon of boiling water at a time until it's the texture that you want.
Once the cakes are cooled, pipe or spoon on the icing, and scatter over the sprinkles.
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