Indoor S'mores recipe winterfavorites Ingredients 1 cup chocolate chips 8 large marshmallows graham crackers for dipping Instructions Preheat the oven to 450. In a cast iron skillet, add the chocolate chips. Snip the large marshmallows in half and top the chocolate chips with them. Once the oven is up to temperature, add the skillet to the oven. Bake for 7-9 minutes.