Preheat your oven to 350°F (175°C) and prepare a 9×5-inch loaf pan by greasing it or lining it with parchment paper.

In a large mixing bowl, mash the bananas until smooth. Add melted butter, granulated sugar, brown sugar, egg, and vanilla extract. Mix well.

In a separate bowl, combine all-purpose flour, baking powder, salt, and optional cinnamon. Whisk to combine.

Gradually add the dry ingredients to the wet ingredients and fold gently until just incorporated. Avoid overmixing.

If using, fold in optional chocolate chips or nuts.

Pour the batter into the prepared loaf pan.

Bake for 40-50 minutes or until a toothpick inserted in the center comes out clean.

Allow the bread to cool in the pan for 10 minutes before transferring to a wire rack.

Let it cool completely before slicing.