Prep: Preheat the oven to 350° F. Spray or line a muffin tin.
Whisk: In a medium bowl, whisk together the flour, baking powder, baking soda, salt, and cinnamon.
Stir: In a large bowl, stir together the mashed banana, maple syrup, butter/oil, eggs, and vanilla extract.
Combine: pour the dry ingredients into the wet ingredients and stir until just combined. Do not overmix.
Fill Muffin Tin: Scoop the batter into the muffin tin 3/4 of the way full. Add any toppings, if using.
Bake: Place the muffin tin into the oven, and bake for 18-20 minutes or until just golden brown.
Eat: Let cool for 5-10 minutes, and serve.