Preheat oven to 375 degrees F and spray non-stick 12 muffin tin with cooking spray. Set aside. In a large mixing bowl, lightly whisk the egg. Add bananas and mash well. Add maple syrup, oil, vanilla, baking powder and soda and salt; whisk to combine. Add flour and gently stir until well incorporated. Do not over mix otherwise muffins will be tough. Fill each opening almost full with batter (I used regular ice cream scoop) and bake for 22 minutes or until a toothpick inserted in the centre comes out clean. Let muffins cool for about 5 minutes and then transfer to a cooling rack to cool off completely.