Preheat the oven to 350 degrees.
Grease 2 regular muffin pans, or line with muffin liners.
Add your butter and sugar to a large bowl and beat together for about 2 minutes until they are light and creamy.
Add in the eggs and stir till just combined.
Mash your bananas in a small bowl.
Add the bananas and vanilla extract to the sugar mixture and stir till combined.
Add in the flour, baking powder, baking soda, and salt and stir slowly until combined.
Fold in the chocolate chips.
Scoop the batter into the prepared muffin tins, filling each about 3/4 full.
Bake the muffins for 20-24 minutes until the tops are golden brown, and an inserted toothpick comes out clean.
Cool in the muffin pan, until cool enough to handle, then loosen and remove to cool completely on a wire rack.