Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.

Lay out the mini pizza crusts on the lined baking sheet.

Spread a generous layer of pizza sauce over each mini pizza crust.

Cut mozzarella slices into ghost shapes using cookie cutters and place them on the pizzas along with olive slices for eyes.

Layer shredded mozzarella in a criss-cross pattern for mummy pizzas, adding olive slices as eyes.

Cut the orange bell pepper into shapes for jack-o'-lantern faces and layer on top of the cheese.

Bake the pizzas in the preheated oven for 8-10 minutes until cheese is bubbly and crust is golden brown.

Remove from the oven, let cool briefly, and serve warm.