1. Preheat your oven to 350 degrees. Line a muffin tin with paper liners and set aside.
2. Combine the sugar, oil, egg, sour cream, and vanilla extract in a mixing bowl. Whisk until the mixture is combined fully. Stir in the mashed bananas.
3. Stir together the flour, baking soda, salt, cinnamon, and nutmeg in a separate bowl.
4. Stir the dry ingredients into your wet ingredients until incorporated.
5. Fold in 1 cup of chocolate chips.
6. Divide the batter between your prepared pans, filling each liner 3/4 full with batter.
7. Sprinkle additional chocolate chips onto each batter filled cup or place 1 slice of fresh banana onto each.
8. Bake 18-20 minutes, or until lightly browned and a toothpick comes out clean.