Prepare Batter: In a large bowl, mash the bananas until smooth. Add the flour, baking powder, baking soda, salt, and sugar (if using). Mix lightly to combine.

Add Wet Ingredients: Stir in the milk, egg, vanilla extract, and melted butter until a smooth batter forms. Do not overmix; a few lumps are okay.

Heat the Pan: Heat a non-stick skillet or griddle over medium heat. Lightly grease with butter or oil.

Cook Pancakes: Pour 1/4 cup of batter onto the skillet for each pancake. Cook until bubbles form on the surface and the edges look set, about 2-3 minutes. Flip and cook the other side for 1-2 minutes, or until golden brown.

Serve: Stack the pancakes and serve warm with maple syrup, butter, or sliced bananas as garnish.