Preheat your campfire or grill until the coals are hot and glowing.
Take each waffle cone and fill it with a layer of mini marshmallows, followed by chocolate chips, strawberries, and banana slices. Pack the ingredients in tightly.
Once filled, wrap each cone in a piece of aluminum foil, ensuring it is tightly sealed to prevent any ingredients from falling out.
Place the wrapped cones over the campfire or on the grill. Cook for about 5-7 minutes, turning occasionally, until the chocolate and marshmallows are melted.
Carefully unwrap the foil (it will be hot!) and enjoy your gooey, delicious campfire cones.