Preheat oven to 375°F and spray a medium-size baking dish or cake pan with coconut oil cooking spray. In a large bowl, mash banana well. Then, add in eggs, peanut butter, vanilla extract, honey (or maple syrup), and almond milk and mix until smooth.
Add rolled oats, flour, baking powder, and salt (& cinnamon if using), and mix until everything is thoroughly combined.
Transfer batter into baking dish and slice a few bananas on top.
Bake at 375° for about 30-40 minutes (it will depend on the size and depth of your baking dish) or until firm. Enjoy!