Preheat your oven to 350°F (175°C). Line a muffin tin with paper liners.
In a bowl, mash the ripe bananas with a fork until smooth.
In a separate bowl, combine the melted butter, vanilla extract, granulated sugar, and brown sugar. Mix until well combined.
Add the mashed bananas to the wet mixture and stir until incorporated.
In another bowl, whisk together the flour, baking soda, and salt.
Gradually add the dry ingredients to the wet mixture, mixing until just combined.
Gently fold in the chocolate chips into the batter.