01 - Preheat oven to 350°F.
02 - In a microwave-safe bowl, combine chocolate chips and heavy cream. Microwave in 30-second increments, stirring after each, until the mixture is melted and smooth.
03 - Pour melted chocolate mixture into a 9-inch oven-safe skillet or baking dish. Spread evenly over the base.
04 - Arrange marshmallows over chocolate, covering the surface completely. For a spooky appearance, use ghost-shaped marshmallows or decorate with chocolate chips and sprinkles.
05 - Bake for 8 to 10 minutes, or until marshmallows are puffed and golden brown. Monitor closely to prevent over-browning.
06 - Remove from oven. Sprinkle with Halloween-themed decorations if desired. Serve warm with graham crackers and fruit slices for dipping.