Step 1

Preheat the oven to 180 degrees Celsius (350 Fahrenheit).

Step 2

Peel the bananas and add them to a food processor together with the peanut butter and cocoa powder.

Step 3

Blitz until you get a smooth consistency.

Step 4

Grease a 6-hole muffin tray/small square baking tray with oil or butter, and distribute the batter evenly.

Step 5

Top with chocolate chips and chopped nuts - optional.

Step 6

Bake for 20-25 minutes until the edges and the top are firm and the brownies are well risen.

Step 7

Remove from the oven and leave to cool down completely.