Sift flour n baking powder in a bowl

In a separate bowl, mix margarine and sugar till light and fluffy

Add an egg at a time and mix well, then add in the vanilla

Add in flour alternating with milk and mix well but don't overmix

Scoop some batter and add in the cocoa powder

Now put your white batter in a greased pan, then add in the cocoa mix in patches, swirl with a knife, so that the cocoa mixes with white batter

Put the mixture in a pre heated oven and at 180deg bake for 30min or till the cake is done

Let cake cool in pan before removing it out

Cake is now ready