Fill an 8" cast iron skillet* with layers of graham crackers, chocolate chips, and marshmallows. Bake for 10-15mins or until marshmallows are golden (broil if desired).
Drizzle with melted chocolate if desired. Allow to cool slightly before serving.
Notes
*If you don't have a cast iron skillet, you can use any oven safe dish or pan (casserole dish, cake pan, etc.).The ingredient amounts listed are approximate -- use more or less of anything you like!