In a bowl mix d butter and sugar till it become fluppy and white

Add d egg one at a time and mix it will

And add d dry ingredients and combine it with d mixture

Divide d mixture into 2 put

Add coco powder in one mixture and stair

Wipe butter in your pan

Put d white mixture and d coco powder mixture,continue d process until u mixture finished

Put a fork and draw some zig zag or circle

And bake

Enjoy