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Heat your oven to 200˚C/180˚C fan/gas mark 6 or light the barbecue.
Using a small knife, cut out a strip of the banana peel all along the top of one side, so you have a window into each one, then cut a slit in the banana inside.
Spread a tablespoon of peanut butter inside each banana then cram as many chocolate chips and mini marshmallows on top of the peanut butter inside the banana as you can.
Wrap each whole banana tightly in foil individually and oven cook or barbecue for 10 minutes until the chocolate and marshmallows have melted and become gooey. Open one up and have a peek to make sure the banana is soft and the toppings are melted.
TILLY'S TIP: You can also put the foil-wrapped bananas into the hot coals of a fire and leave them until you are ready to eat them but make sure you use tongs with really long handles to put them in and take them out of the fire. Be careful!