In a bowl add sugar nd butter mixed them until sugar started melting

Add egg bit by bit

Continued mixing until soft nd fluffy

Mixed flour,baking powder,powder milk in another bowl pour in ur butter mixture continue mixing

Divide ur cake mixture into 2 add cocoa powder to one mixture mixed well

Put butter in ur baking pan bring ur normal cake mixture put 1 spn den put d cocoa mixture 1 spn continue repeatng d process until ur finish all da batter then pre heat ur oven ndbake until ur inserted a took pick nd come out clear