01 - Preheat oven to 350°F. Grease a 9×5-inch loaf pan or line with parchment paper.
02 - Whisk together mashed bananas, melted butter, granulated sugar, brown sugar, eggs, and vanilla until smooth.
03 - In a separate bowl, whisk together flour, baking soda, baking powder, and salt.
04 - Add dry ingredients to wet mixture and gently fold until just combined. Do not overmix.
05 - Fold in chocolate chips and nuts if using.
06 - Pour batter into prepared loaf pan. Sprinkle additional chocolate chips on top if desired.
07 - Bake for 50–60 minutes until a toothpick inserted in the center comes out with just a few moist crumbs.
08 - Cool in pan for 10 minutes, then transfer to wire rack to cool completely before slicing.