Preheat and prep. Preheat the oven to 375 degrees F, line a baking sheet with parchment paper, and arrange the split English muffins cut-side up.
Spread the sauce. Spoon about 1 tablespoon of pizza sauce over each muffin half.
Add the cheese. Use cookie cutters or a sharp knife to cut the cheese slices into Halloween shapes and lay them on top of the sauce.
Decorate. Add olives, peppers, pepperoni, or other toppings to create spooky faces.
Bake. Bake for 10-12 minutes, until the cheese is melty and the muffin edges are golden brown.
Notes
*Estimate based on the ingredient amounts in the recipe card above; will vary based on the specific brands of English muffins, cheese, and sauce used, and which toppings you choose.