Marbelled Coffee Cake:
175g sugar, 175 soft butter, 1 teaspoon vanilla sugar, 3 eggs, 225g white flour, 1 teaspoon baking powder, 50g dark chocolate.
Mix sugar and butter till it is almost white, blend in the vanilla sugar and then one egg at a time. Add flour and baking powder. Split the dough in two and add melted chocolate to the one half. Fill a pan with the white dough and then add the chocolate dough on top.
Bake in 190C for 30minutes.