Crush the biscuit in a blender.

Place the crushed biscuit in a mixing bowl and mix in the baking soda.

Make a well in the center and pour in the milk. Mix together until the batter is smooth and well combined.

Pour the batter into a greased cake tin and some oreo biscuit press on top of the brownie batter.

Bake for 15 to 20 minutes in a preheated kadhai.

Let it cool then demold it cut it and enjoy oreo brownie cake.