Take a round baking tin, grease the entire surface of the pan with oil.
In a large bowl, add oil, yogurt, powdered sugar, vanilla essence and mix well using a wired whisk until smooth.
Now add maida, baking soda, baking powder, milk, vinegar and mix until it turns a little smooth.
Transfer half amount of the batter to another bowl and add cocoa powder, milk to it and mix well.
Take both vanilla and chocolate batter and pour a small-small
amount of them on each other in the cake tin, alternatively.
Use an aluminum cooker, remove the cooker ring and whistle.
Place a stand in cooker and place the cake container over it. Close the lid and cook it for 5 minutes over a high flame and then 45-50 minutes over a low flame.