Slice the bananas thinly.
In a bowl, mix flour, cocoa powder, sugar, and baking powder.
Add eggs, milk, and melted butter to make a batter.
Mix the sliced bananas and chocolate chips into the batter.
Pour the batter into a cake mold.
Bake in a preheated oven at 180°C (356°F) for 35 minutes.
Let it cool to finish.