Preheat the oven to 350F. Line a baking sheet with parchment paper and set aside.
Place the bananas in a bowl and mash them with a potato masher or the back of a wooden spoon. Mash them until the bananas are mostly smooth. A few lumps are okay.
Once the bananas are mashed, add the oats and peanut butter, stirring until everything is well combined. Fold in the chocolate chips. Taste and adjust. If the dough is too dry, add a little more peanut butter. If the dough feels too wet, add ¼ cup more oats.
Drop bite-sized spoonfuls onto the prepared baking sheet and bake for 10-12 minutes. Until lightly browned. Let the cookies cool for 10 minutes on the baking sheet before transferring them to a wire cooling rack.
