01 -
Preheat oven to 375°F and line a baking sheet with parchment paper or a silicone baking mat.
02 -
In a mixing bowl, combine shredded mozzarella, cheddar, and Parmesan cheese. Add Italian seasoning and garlic powder; mix thoroughly. Incorporate red pepper flakes if desired.
03 -
If pepperoni slices are large, slice them in half. Place pepperoni in a single, even layer on the prepared baking sheet.
04 -
Distribute the seasoned cheese mixture evenly over each pepperoni slice.
05 -
Bake for 8 to 10 minutes, or until the cheese has melted, edges are golden, and pepperoni slices are crisp.
06 -
Remove from oven and let cool for several minutes, then transfer crisps to a rack to cool completely. Garnish with chopped parsley, if desired.