01 - Preheat oven to 350°F (175°C).
02 - Combine chocolate chips and heavy cream in a microwave-safe bowl. Microwave in 30-second intervals, stirring after each, until the mixture is completely melted and smooth.
03 - Transfer the melted chocolate mixture into a 9-inch oven-safe skillet or baking dish. Spread evenly across the bottom.
04 - Place marshmallows over the chocolate layer, fully covering the surface. Use ghost-shaped marshmallows or create ghost faces with chocolate chips or sprinkles for a festive appearance.
05 - Bake for 8 to 10 minutes, or until marshmallows are puffed and golden brown. Monitor closely to prevent burning.
06 - Remove dish from oven and sprinkle with Halloween-themed sprinkles if desired.
07 - Serve immediately, offering graham crackers, strawberries, or apple slices for dipping.