Preheat oven to 350F (180C), line a baking tray with parchment paper and set aside.Peel the bananas, place in a large bowl and mash. Add nut butter and mix well.Add oats, baking soda, chocolate chips and mix until combined.Scoop out a portion of the batter into the baking sheet. Press to create a cookie shape and add few chocolate chips on top of each cookie.Bake for 10-12 min, or until golden on the edges.Allow to cool for 10 minutes before serving.