Preheat your oven to 400°F (200°C) and thaw the frozen puff pastry sheets for about 15-20 minutes.

Lightly flour your work surface and roll out the puff pastry. Cut out approximately 8 ghost figures using a ghost-shaped cookie cutter.

Spread a thin layer of marinara sauce on half of the ghost-shaped pastries, leaving a ¼-inch border around the edges.

Layer thin slices of pepperoni and shredded mozzarella cheese on top of the marinara. Customize with your favorite toppings if desired.

Carefully place the remaining ghost-shaped puff pastry cutouts on top and press the edges firmly to seal.

Beat an egg with a splash of water to create an egg wash. Apply this mixture over the tops using a pastry brush.

Bake the ghost pastries for 13-15 minutes until they are puffed up and golden brown.

Remove from the oven and let them cool on a wire rack for about 3-5 minutes before serving.