Preheat the oven to 350 degrees F. Line a cookie sheet with parchment paper.
Place the banana in a bowl and mash well with a fork. Stir in the oats and peanut butter and mix together.
Add the chocolate chips and stir well.
Drop cookies onto prepared baking sheet. Use the back of a spoon to flatten each cookie slightly.
Bake at 350 degrees F for 12-14 minutes. The bottom of the cookies should be golden brown.
Let cookies cool for about 15 minutes before eating.
Notes
Nutrition facts are for one cookie.Store in an airtight container for up to 3 days. If you want to store them for longer, place in the refrigerator - they should stay fresh for up to a week.