In a bowl break egg and separate egg white and egg yolk in bowls.. First of all beat egg white until it foamy then add egg yolk, powdered and beat it until creamy...

Then add all-purpose flour in beaten eggs in a portion and fold it with light hands... Now separate half cake mixture in a separate bowl and add cocoa powder in it and fold it.

In take a non-stick pan and grease it with oil. Now add one tbsp of vanilla cake batter than add one tbsp of chocolate cake better repeat the same process until all cake better or done...

Now on a medium to low flame cook cake for 8 to 10 minutes until cake size is doubled now change the cake side and other side for two minutes... Now take out cake from pan.. And cool it at room temperature now dust some powdered sugar on the top of the cake... And serve it...

Note: before adding all-purpose flour, sugar, coco powder in cake please sieve it...