Preheat your oven to 175°C (350°F) and line a muffin tin with paper liners. Bake unpeeled ripe bananas on a baking sheet for 15-20 minutes until tender.

In a large mixing bowl, mash the bananas. Add granulated sugar, vegetable oil, eggs, vanilla extract, and vinegar. Mix until smooth.

In a separate bowl, whisk together all-purpose flour, baking powder, baking soda, and salt. Gradually add to the wet ingredients and fold gently.

Gently fold in the chocolate chips until evenly distributed.

Fill each muffin cup about 3/4 full with the batter. Bake in the preheated oven.

Bake for 18-20 minutes or until a toothpick comes out clean. Let cool for 5 minutes before transferring to a wire rack.