Preheat the oven to 190C(Gas 5/375F). Line the cupcake tin with cupcake cases.

Place the butter and sugar into a bowl, Whisk until pale and fluffy

Add the eggs one at a time, Add a little flour after each one. When combined add the vanilla and the cocoa powder, stir until combined.

Divide up into the cupcake cases, Bake for 20 minutes until golden and risen.

When cool make the icing, place the butter and the icing sugar into a bowl, mix together with the back of a spoon until soft and light.

Place the icing into a piping bag and decorate the cupcake