Sieve In ur flour and baking powder together in one bowl add all the dry ingredients and set a side

Beat ur butter and sugar until fluffy. Separate the egg whites from the yolk and beat them separately and be adding it bit by bit to the butter mixture add ur dry ingredients and make a batter add the milk after mixing everything. Divide the batter into two equal amounts and add cocoa powder mixture to the batter

Use different spatula to the batter grease ur pan and start adding the batter add the plain then follow by the cocoa mix batter keep adding using the same method until the batter finish.

Use toothpicks to draw lines at the top of the batter and make the design bake at preheated oven at 180 degrees