Preheat the oven to 350°F (175°C) and grease a 4×8-inch loaf pan.
In a large bowl, mash the ripe bananas with a fork until smooth.
Stir in the melted butter until well combined.
Sprinkle baking soda and salt over the banana mixture, then add the vanilla extract and stir well.
Mix in the sugar and beaten egg until smooth and creamy.
Gently fold in the flour until no streaks remain. Do not overmix.
Add the chocolate chips and stir lightly to distribute them evenly throughout the batter.
Pour the batter into the prepared loaf pan. Bake for 60–65 minutes or until a toothpick inserted in the center comes out clean.
Let the bread cool in the pan for 10 minutes, then transfer to a wire rack to cool completely before slicing.