Beat margarine, oil and sugar till light and fluffy

Add 1 egg at a time beating in between to form peaks, add vanilla essence

Sieve flour and baking powder in a separate bowl

Add flour mixture to the butter mixture and fold in well

Scoop little batter aside add two tablespoon of cocoa and little hot milk, mix well

Then pour half of vanilla batter in baking tray then chocolate batter use toothpick and spread the chocolate batter

Pour the remaining vanilla batter

Bake in a pre heated oven at 170C till done