Preheat the oven to 350 degrees Fahrenheit. Line a 12-cup muffin tin with paper liners or grease well with cooking spray.

In a large mixing bowl, mash the bananas until smooth. Add the brown sugar, maple syrup, oil, oat milk and cinnamon and mix until incorporated.

Add in the flour, baking powder, and salt and stir until combined. Scoop the batter into prepared muffin cups.

Bake for 15-18 minutes or until muffins spring back to the touch. Allow to cool before removing from the pan.