Preheat oven to 350˚F (180˚C).
In a mixing bowl, mash the bananas until smooth.
Melt the butter in the microwave in 30 second increments and mix it into the banana mixture until well combined.
Add the sugar, egg, vanilla and mix until well combined.
Add the baking soda, salt, and flour and mix just until no lumps are visible. Do not overmix.
Add in the mini chocolate chips and gently fold into the batter.
Pour the batter into a greased loaf pan or a parchment-lined loaf pan. Add additional chocolate chips to the top if you wish.
Bake for 50 to 55 minutes or until a toothpick comes out clean.
Remove the banana bread from the pan and allow it to cool completely before serving.