Pre-heat the oven to 350°F.
Brown the butter in a saucepan over medium-low heat. Once browned, remove from heat and let it cool for 10 minutes.
Whisk in the brown sugar until fully incorporated.
In a separate bowl, mash the overripe bananas and add them to the butter-sugar mixture. Whisk until fully combined.
Whisk in the egg and vanilla extract.
In a separate bowl, whisk together the flour, baking soda, and salt.
Pour the flour mixture into the banana batter and gently fold to combine.
Add in the chocolate chips.
Pour the mixture into a lined or greased bread pan.
Bake the bread at 350°F for 55-65 minutes. Halfway through, add aluminum foil over the bread to avoid too much browning on the top. Use a knife to test if the bread is done. If it comes out clean, the bread is done. If batter comes out with the knife, put it back in the oven.
Once the bread is done baking, allow it to cool for at least one hour before slicing.
