Preheat oven to 180°C (350°F).

Mash bananas in a mixing bowl until smooth and lump-free.

Add eggs and mix until creamy and uniform.

Gradually add cocoa powder, stirring until thick, glossy, and no dry patches remain.

Line a small baking pan with parchment paper or grease lightly. Pour in batter and spread evenly.

Bake for 18–22 minutes until top is set and a toothpick comes out mostly clean.

Let cool completely in the pan before slicing (about 30 minutes).