Double chocolate marble cake

Butter and line a round baking tin. Preheat the oven to gas mark 5/180C.

Beat the butter, sugar, and then gradually the eggs, one at a time.

Split the mixture between two bowls. Add the white chocolate to one bowl, and dark to the other. Then, mix the cocoa powder in the dark chocolate mixture, but not the white chocolate mix.

Fold in half the flour for each bowl, and pour into the baking tin.

Bake for 25-40 minutes.

Enjoy!