Preheat oven to 350 degrees and prepare muffin tin for 5 muffins
Step two:
In a bowl add banana, sugar, egg, and oil and stir well. Add flour, baking powder, baking soda, cinnamon and salt. Stir until just combined, it will still be lumpy.
Step three:
Fill muffin tin with batter, filling each one about 2/3 of the way full. Bake for 20-25 minutes until a toothpick comes out clean.
Step four:
Cool for 5 – 10 minutes and then transfer to a cooling rack.