Preheat your oven to 350°F (175°C).

Grease a loaf pan with butter or cooking spray.

In a large mixing bowl, combine the mashed bananas, applesauce, melted butter, brown sugar, granulated sugar, egg, and vanilla extract.

In a separate bowl, whisk together the baking soda, salt, and flour.

Gently fold the dry ingredients into the wet mixture using a rubber spatula until just combined.

Transfer the batter into the prepared loaf pan, smoothing the top.

Bake in the preheated oven for about 60 minutes or until a toothpick inserted into the center comes out clean.

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