Take flour in a bowl and add baking powder and soda.

Add salt and mix well with spoon.

In another bowl take milk and add butter and vanilla essence.

Add sugar and whisk well till frothy.

Add this into flour and mix well to make a thick batter.

Divide the batter in two equal parts and add cocoa powder in one bowl.

Transfer the plain batter in muffin tray and pour chocolate batter over it

Make a pattern with spoon and bake in the oven for 15 minutes on 200°C.