Preheat the oven to 175 ° C and grease a loaf tin and lay out with parchment paper.
Add banana, sugar and oil in a food processor and blend until well combined.
Add the remaining ingredients (except the chocolate + cocoa) and blend again. Now you will have a smooth batter. Divide the dough in half and mix one with the cocoa and the chocolate. Pour in the tin and start with the bright dough and end with chocolate. Sprinkle peanut butter on top and mix with a fork.
Put in the oven and bake for 40-45 minutes. (make chopsticks sample.)
Allow to cool for a few minutes in the mold and then allow to cool completely on a grid.