Preheat oven to 350°F. Lightly spray a half baking sheet with oil.
Mash the bananas in a bowl.
Add the oats and peanut butter. Mix.
Roll, then flatten 10-12 small cookies (5-6 large) and place on the prepared baking sheet.
Bake at 350°F for about 12 minutes or until the cookies are golden brown, as shown.
Video
Notes
The cookies will keep for a few days in a sealed container. Enjoy them warm from a toaster oven or at room temperature for a quick fiber-filled breakfast!