To bake in the oven: Preheat oven to 350 degrees. Place foil-wrapped cones in a single layer on a baking sheet and bake for 6-8 minutes or until marshmallows are melted.
To cook on the grill: Place foil-wrapped cones on a heated grill for 5-10 minutes, turning occasionally until marshmallows are melted.
To cook over the campfire: Heat the foil-wrapped cones over a campfire for about 3-5 minutes, or until the marshmallows have melted.