Preheat oven to 350°F (175°C).
Grease a standard 9×5-inch loaf pan. For easy removal, line the bottom with parchment paper.
In a large mixing bowl, mash the bananas until mostly smooth.
Add the egg, vanilla extract, brown sugar, granulated sugar, and cinnamon. Stir until well combined.
In a separate bowl, whisk together the flour, baking powder, baking soda, and salt.
Add the dry ingredients to the banana mixture and stir until just combined.
Gently mix in the melted butter or applesauce.
Pour the batter into the prepared loaf pan and smooth the top.
Bake for 35–45 minutes or until a toothpick inserted into the center comes out clean.
Allow the loaf to cool in the pan for 5–10 minutes.
Carefully remove from the pan and transfer to a wire rack to cool completely.
This Healthy Banana Bread tastes delicious warm or at room temperature and becomes even more flavorful the next day.