Preheat the oven to 350 degrees F. Spray the muffin pans with a non-stick spray or use paper liners.
Whisk together the flour, baking powder, and salt in a large bowl. Set aside.
Mash the bananas, add the egg, melted butter, sugar, egg, and sugar in another bowl.
Create a well in the center of the dry ingredients, add the wet ingredients, and fold until just combined.
Scoop the batter into the muffin pan.
Bake for 20 to 25 minutes or till the muffins spring back when lightly tapped.