Preheat oven to 450 degrees.
Place the banana on a work surface with the ends pointing up.
Using a small, sharp knife, cut a horizontal slit down the inside so you can open the peel like an envelope and stuff it.
Being careful not to rip open the peel, spread one tablespoon of Nutella in each slit and add one ounce of chocolate chips.
Close up the banana peel and wrap the banana in foil.
Repeat with the remaining bananas.
Place bananas on a baking sheet and bake for 10 minutes or until the inside of the bananas are soft and warm and the chocolate is melted.
To serve, peel off the foil from each banana and, using your thumbs, pop the baked bananas out of their peels into oval dessert bowls.
Place two to three scoops of ice cream onto each banana and serve.