Preheat oven to 450° with cast iron skillet in oven

Take out and put in vegetable oil and coat the bottom and up the sides of pan.

Pour in Choc. Chips and smooth out into an even layer.

Put peanut butter cups on top.

Put the marshmallows on top of that.

Put back in oven for 5-7 min or until marshmallows are browned to your liking.

Take out and wait 5 minutes before serving. Serve with Graham crackers.