Preheat the oven to 375F. Mash one ripe banana, add the egg, natural peanut butter and pure vanilla extract. Give it a stir and add the rolled oats and baking powder.
Stir again and pour into a muffin tin lined with parchment paper cupcake liners. I get 4 medium muffins out of this recipe so feel free to double or triple it.
Bake for 22-25 minutes or until light and golden.
Enjoy with salted butter or anything you like.