Sieve flour with the baking powder 2 times and set aside. In a bowl cream butter and sugar together.

Add eggs and flour alternatively to the mixture and stir well. Add vanilla essence and milk to attain a dropping consistency.. Set aside 1/4 of the batter and add cocoa and stir well

Prepare the baking dish by greasing and dusting with flour. Pour the vanilla cake batter and pour over the chocolate batter. Create swirls with the edge of a knife

Bake between 200 to 250 degrees Celsius until done.