Preheat the oven to 350 degrees Fahrenheit.
Mash the bananas. Set aside.
Combine flour, baking powder, salt, and baking soda in a bowl. Mix using a wire whisk. Set aside.
In a large mixing bowl, combine the mashed bananas, butter, egg, vanilla extract, and granulated white sugar. Mix well.
Fold-in the dry ingredient mixture in the large mixing bowl. continue this step until
the texture becomes smooth.
Arrange regular sized paper cups in the muffin pan. Scoop the mixture in each paper cup. Do not fill the cup as it will overflow.
Bake in the oven for 13 to 16 minutes.
Remove from the oven and let cool by placing in a wire rack.
Serve. Share and enjoy!