Preheat the oven to 350°F (175°C). Grease a loaf pan.

In a mixing bowl, mash the ripe bananas until smooth.

Add the beaten egg, melted butter, and vanilla extract to the mashed bananas. Mix well.

In another bowl, combine the flour, brown sugar, baking soda, and salt.

Gradually add the dry ingredients to the wet ingredients, stirring until just combined.

Fold in the chocolate chips.

Pour the batter into the prepared loaf pan.

Bake in the preheated oven for 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 to cool completely.