Using a small paring knife carefully slice the banana peel from top to bottom. Open up the peel like a pocket. Spread the banana with the chocolate hazelnut spread, equally divided between the 6 bananas, top each with the marshmallows and sprinkle with chopped nuts. Gently fold the banana peel back in place, wrap the bananas in aluminum foil and cook over the coals for about 10 minutes.
Recipe courtesy of Michael Chiarello