Prepare Potatoes: Peel and chop the large russet potatoes into 2-inch chunks. Boil them in a pot of salted water for about 15-20 minutes, or until fork-tender.

Mash Potatoes: Drain the cooked potatoes and return them to the pot. Add the heavy cream, melted butter, salt, and pepper. Mash until smooth.

Shape into Skulls: Use a skull mold or hands to form the mashed potato mixture into skull shapes, packing tightly.

Decorate: Press half black olives into the eye sockets for a spooky touch. Add more olives for mouth features if desired.

Bake: Preheat oven to 375°F (190°C). Place shaped potatoes on a baking sheet and bake for 15-20 minutes until golden and crispy.

Serve: Garnish with fresh chives or green onions. Serve warm.