Preheat the oven to 350°F and place twenty-four paper liners in muffin tins. In a large bowl, mix sugar, bananas, butter and eggs. Whisk flour, baking soda and salt in a separate bowl. Add the flour mixture to the banana mixture and stir in chocolate chips. Divide batter between the two muffin pans and bake for around 25 to 30 minutes.