Beat butter with caster sugar.
Mix flour and baking powder together.
Beat eggs with beater till they get fluffy.
Mix coco powder, flour mixture and beaten eggs in small intervals and in less quantity.

Keep beating while mixing all of them.
Add milk while beating the mixture.
Pour this dough mixture in greased pan.

Place this pan in a preheated oven at 180c for 20-30 minutes.

For icing: Heat up butter in a pan till it melts.
Add vanilla essence and milk.
Now add icing sugar and cocoa powder. Then decorate it on cake 😊