Preheat your oven to 350°F (175°C). Grease a standard 9×5-inch loaf pan and line the bottom with parchment paper if desired.
In a large mixing bowl, mash the bananas until mostly smooth.
Add the egg, vanilla extract, brown sugar, granulated sugar, and cinnamon. Stir well until combined.
In a separate bowl, whisk together the flour, baking powder, baking soda, and salt.
Gradually add the dry ingredients to the banana mixture and stir gently until combined.
Fold in the melted butter until fully incorporated.
Pour the Healthy Banana Bread batter into the prepared loaf pan and smooth the top evenly.
Bake for 35–45 minutes or until a toothpick inserted into the center comes out clean.
Allow the bread to cool in the pan for 5–10 minutes before transferring to a wire rack to cool completely.