Preheat the oven: Set it to 350°F (175°C).
Line a baking sheet with parchment paper.
Mash the bananas: In a large bowl, mash the bananas until mostly smooth with a few small lumps.
Stir in wet ingredients: Add nut butter, vanilla, and maple syrup or honey (if using). Mix until well combined.
Add dry ingredients: Stir in oats, cinnamon, baking powder, and salt until the mixture holds together. Fold in your add-ins.
Scoop the dough: Use a heaping tablespoon or cookie scoop to portion the dough onto the baking sheet.
Flatten gently with the back of the spoon—these won’t spread much.
Bake: Bake for 12–15 minutes, until the edges are set and lightly golden.
Cool: Let the cookies cool on the pan for 5 minutes, then transfer to a rack to finish cooling. They’ll firm up as they cool.
Enjoy: Eat warm or at room temperature. Great with coffee, tea, or a glass of milk.