Do NOT peel the banana!
Cut two slits on the small curve of the banana and one on the top so you have a flap of peel.
Cut out a slice of the banana (and eat it)and fill the inside with the chips and marshmallows.
Fold the flap of peel back over so it looks like a regular banana.
You might have to smoosh the marshmallows.
Stick in a pan in the oven about 350 degrees and bake till the banana peel is black.
Take them out, open up, and eat with a spoon.
Tracy T. MN