Preheat oven to 350°F.
In a food processor, process oats until coarsely ground.
In a medium mixing bowl, mash bananas with a fork until smooth. Mix in ground oats. Using a small portion scoop, scoop out banana oatmeal cookies onto a parchment-lined baking shee.
Bake for 15 minutes or until light brown on the bottom. Cool completely before eating.