In a large bowl mix mashed bananas, beaten egg, rolled oats and melted butter until well combined, set aside

In a small bowl combine brown sugar, cinnamon, nutmeg, baking powder and salt, stir to combine

Preheat oven to 350 degrees

Grease one mini muffin tray very well

Combine banana and spice mixture until well incorporated

With a small cookie scoop or tablespoon, fill each muffin container ¾ of the way full

Bake 10-12 minutes or until browned and a knife inserted into the center comes out clean

Let cool at least 10 minutes before removing bites from the muffin tin