Preheat the oven to 350°F. Line a baking sheet with parchment paper, set aside.
In a medium bowl, add the oats, mashed banana, applesauce, peanut butter (or any nut butter), egg, vanilla, and cinnamon. Stir until the batter is blended and combined.
Use a cookie scoop or spoon to form the 1-½ - 2 tablespoon size cookie balls and place onto the baking sheet. Flatten the cookies so they are all about ½ inch thick.
Bake for about 10 minutes or until they are slightly golden around the edges. Remove from the cookie sheet and let cool.
