Sieve flour, baking powder, baking soda.
Mix curd, sugar powder, vanilla essence, milk and oil.
Mix the dry ingredients to the wet and make a smooth batter.
Divide the batter into two parts.
Add cocoa and coffee to one.
Take about 2 tbsp batter of vanilla flavour , then on top of the vanilla pour 2 tbsp of chocolate batter.
Similarly finish all batter using it alternatively. You shall see concentric circles are formed.
Tap the tin gently and place the cake in a preheated oven.
Bake at 180 deg C for 30-35 minutes or till a skewer comes out clean.
Remove the cake and let it cool for 15 minutes.
Remove the cake and let it cool for 15 minutes.
Cut into wedges and serve.