In a large mixing bowl, mix the mashed bananas, vegan butter, maple syrup, cinnamon, baking soda, baking powder, and vanilla. Then, add almond or oat milk and mix. Finally, stir in quick oats and oat flour.
Fill 12 lined muffin cups halfway with the batter, drop a dollop of hazelnut spread (about ½ tablespoon each) in the center of each cup. Then, Top with the remaining batter. Bake for 25-20 minutes in the oven until golden brown.