Start by adding the bananas in a round baking dish.
Add the baking powder and using a fork, mash the bananas very well.
Add the eggs, the cocoa powder and mix until combined.
Next, add the chocolate powder and mix again until incorporated.
Transfer this batter to a baking dish greased with margarine and chocolate powder and spread this batter evenly until flat.
Add the milk chocolate chopped into cubes.
Microwave it for 3 minutes.
Next, using a plate, unmold it and transfer it to a nice serving plate then cut it into squares.
Serve.