Preheat oven to 350F (180C).
Peel the bananas, place them in a bowl and mash until smooth.
Add nut butter/seed butter and mix until combined.
Add oats and the extra topping that you like (chopped nuts, dried fruits, chocolate chips etc.), then add baking soda and mix until combined.
Scoop out a portion of the batter on a baking tray lined with parchment paper.
Bake for 10-12 minutes or until the edges are golden brown.
Allow to cool slightly before serving.
