Preheat oven to 350 degrees.
Line a baking sheet with parchment paper and spray with cooking spray.
In a large mixing bowl, mash ripe bananas with a fork.
The add Lean, oats and peanut butter. Mix well.
Add raisins (or personal preference of mix-ins).
Spoon onto baking sheet. Be sure to shape the batter into cookie shape before baking (this batter will not spread during baking).
Bake for 12-14 minutes and then immediately cool on a rack for 5 minutes.