Lay the bananas so the ends are pointing up. Using a knife, cut a slit down the inside top so you can open it like an envelope, careful not to rip open the peel. Spread 1 tablespoon of peanut butter inside each banana and sprinkle with chocolate chips. Close the peel of the banana up and wrap the entire banana in aluminum foil. Place the bananas on a baking sheet and transfer to the oven to bake, about 10 minutes or until the insides of the banana are soft and warm and the chocolate is melted.