Start a campfire or heat up the grill.
Layer chocolate chips and mini marshmallows in the sugar cones, adding a few layers until your cones are as full as possible.
Wrap your sugar cone s'mores separately in aluminum foil. Make sure each one is completely covered.
Add your s'mores to a warm grill, or place them over the fire*.
Allow the s'mores to cook for about 5 to 10 minutes.
Using a pair of tongs, remove your s'mores from the fire or grill, and carefully unwrap the foil; be careful, it's hot! Watch the marshmallow, especially, as you unwrap the foil, so you don't get burnt.
You can let it cool for a few minutes, then dig in and enjoy!