Preheat oven to 350F.
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).
OR
Place pan over a campfire using a grate, or directly on a grill heated to high heat.
Cook for about 10 minutes until marshmallows are golden brown and begin to melt
Drizzle with melted chocolate if desired. Allow to cool slightly before serving.