Preheat the oven to 425 degrees Fahrenheit. Line two muffin pans with muffin liners in every other spot.
Add the butter and sugar to a large bowl and beat together for about 2 minutes until they are light and creamy. 1/2 cup butter, 1 cup granulated white sugar
Add in the eggs, and vanilla extract and stir till just combined. 2 large eggs, 1 tsp vanilla extract
Mash the bananas in a small bowl. Add the bananas to the sugar mixture and stir till combined. 2 large overripe bananas
Add in the flour, baking powder, baking soda, and salt and stir slowly until combined. 2 cups all purpose flour, 1 tsp baking powder, 1 tsp baking soda, 1/2 tsp salt
Fold in the chocolate chips. 1 cup chocolate chips
Scoop muffin batter into each muffin spot, dividing it evenly between the 12 muffin spots, filling them almost to the top.
Bake the muffins for 5 minutes in the preheated oven.
Lower the temperature to 350 degrees F. Bake for another 13 to 17 minutes, or until a toothpick can be inserted in the center of the muffins and comes out clean, or mostly clean.
Remove the muffins from the oven and let them cool in the pan for 10 minutes. Carefully twist and transfer the muffins to a cooling rack.