Preheat the oven to 350°F. Line a pan with parchment paper. Peel the banana, place in a bowl, and mash with a fork.
Add all other ingredients to the bowl. Combine well.
Add the mixture to the pan. Smooth out. Sprinkle chocolate chips on top.
Bake the mixture for 25 minutes. Turn off the heat and let the baked oatmeal sit in the oven for additional 5 minutes.