I searched & got this marble cake recipe here.I omitted bananas & made this cake.
Ingredients :1 cup multigrain atta ( I used Pillsbury ) ,3/4 cup brown mineral sugar, 1/2 tsp baking soda,1/2 tsp baking powder, 2-3 tbsp cocoa powder or Bournvita powder ( I used 1 tbsp milk chocolate powder which I had at home & 1.5 tbsp Bournvita powder ) ,1tsp vanilla essence, 1 cup yoghurt,2tbsp oil,salt a pinch.
Method : Mix atta, baking soda,baking powder,salt & sugar with a fork or whisk many times so that all dry ingredients are finely mixed with each other.Keep aside.
Mix liquid ingredients :oil,vanilla essence & yoghurt with whisk.Now make a well in dry ingredient mix & pour the wet ingredient mix.Mix nicely.Add water if needed.It must have drop down consistency.Divide this batter into 2 equal parts.In one part add the chocolate.I added chocolate just like that.I should have boiled a little water & dissolved chocolate in that hot water & then added to batter.I was afraid that batter may get runny.Hence some Bournvita chunks can be seen in cake pieces as dark blobs.
Line a microwaveable vessel with butter paper.Pour a layer of plain batter ( without chocolate ) into it.Put some spoons of chocolate batter next.Repeat with plain & chocolate batter till both batters get over.With a fork or knife ,make a swirl pattern in the batter.
Bake in microwave for 8-10 minutes.Let it cool.Take out from microwave.Test with knife.If it comes out clean ,cake is done.Otherwise bake for 1-2 minutes more Repeat knife test.
Let it cool inside microwave for 10 minutes.After 10 minutes,let it cool for 20 minutes outside microwave.Then put the vessel upside down on plate.The cake will drop down on plate or can be gently loosened from sides.Let it cool for 10-15 more minutes.Cut into desired pieces & serve.
It is so healthy - multigrain atta ( wholegrains ) ,yoghurt,brown sugar,low fat ! What more is needed ? !