Measure all ingredients, grease and line rectangular cake pan, can use any shape pan you like. Preheat oven

Strain flour bp together 3times

Now beat butter and add sugar gradually till creamy add eggs one by one and add vanilla essence, keep beating for few secs

Add flour gradually and fold with a spatula till all maida /flour is incorporated, if required add lukewarm milk when desired consistency comes than divide this mixture take out 1/4 batter in a bowl and mix cocoa powder. Pour white batter in cake pan than cocoa one on top than with a skewer or knife make marble effects on top and deep inside, than tap pan few times and put in preheated oven at 180 for 40_45 mins or until done

Take out and cool on a rack,