Preheat oven to 350 degrees and line a baking sheet with parchment paper.
Combine banana, peanut butter and maple syrup until mixed well.
Stir in oats.
Fold in chocolate and M&M's.
Spoon mounds of mixture onto parchment where you want cookies. Use your hands to form them into cookie shapes, pressing gently to make sure they stick together.
Bake for 10 minutes. Remove them from the oven and allow them to cool 5 minutes on the baking sheet before removing them to a wire rack to finish cooling.