Preheat the oven to 175°C.

Prepare a 9-inch square pan by placing a butter paper at the bottom of the pan.

In a bowl, add butter, brown sugar and white sugar. Mix until well combined.

Now add eggs and vanilla essence. Whisk until light in color.

Add the all-purpose flour and salt. Fold in until just combined. Do not over mix at this stage.

Now divide this batter into two parts.

In part 1, add the cocoa powder and chocolate chips (reserve some for topping) and mix.

For part 2, Blend bananas into smooth paste to make 1 cup. Add to the batter along with baking powder. Mix.

Put dallops of thick chocolate batter at the bottom of the baking tin, reserving some for the topping.

Pour banana batter on top and smooth out.

Now add remaining chocolate mixture in dallops and run a toothpick through the batter to make a pattern.

Sprinkle chocolate chips on top and bake at 175°C for 35-40 minutes or until the toothpick inserted comes out clean.

Take out, slice and enjoy with tea or coffee.