Preheat your oven to 350°F (175°C). Grease a 4x8-inch loaf pan.
In a mixing bowl, mash the ripe bananas with a fork until smooth.
Stir the melted butter into the mashed bananas.
Mix in the baking soda and salt. Stir in the sugar, beaten egg, and vanilla extract.
Add the flour last and mix just until combined. Fold in the chocolate chips.
Pour the batter into the prepared loaf pan.
Bake for 55 to 60 minutes, or until a toothpick inserted into the center comes out clean.
Let cool in the pan for a few minutes, then transfer to a wire rack to cool completely.