Fill each cone with desired amounts of marshmallow, dark chocolate chips and blueberry.
Wrap the cones in aluminum foil.
Place over the campfire for about 3-5 minutes or until toppings are melted (keep away from direct flames).
Or if you make them at home, preheat the oven to 375 degrees F. Put in the oven until toppings are melted, about 7-9 minutes. Unwrap the cones and enjoy.