Whisk the eggs with vanilla. Mash the bananas and add them to the eggs
Add the sugar and peanut butter and whisk again.
Sift the cacao and baking powder and add them. Slowly mix to incorporate. You should have a thick runny batter
Prep your baking sheet with parchment paper. If you are using walnuts sprinkle them on top. Bake in a preheated oven on 170 for 22-25 mins
Remove from oven. Allow to cool completely before slicing it.