Preheat your oven to 350°F and line a baking sheet with parchment paper.
In a bowl, mash the bananas until smooth.
Stir in oats, nut butter, vanilla, cinnamon, and salt.
Fold in your chocolate chips or raisins.
Scoop the dough onto your baking sheet and gently flatten each cookie (they won’t spread).
Bake for 12–15 minutes, or until set and lightly golden.
Cool, then store in an airtight container or freeze for later.