01 - Preheat oven to 400°F and line a baking sheet with parchment paper or silicone baking mat.
02 - Place pepperoni slices in a single layer on the prepared baking sheet, spacing them slightly apart.
03 - Distribute the cheddar and mozzarella cheese mixture evenly over each pepperoni slice.
04 - Sprinkle with Italian herbs and red pepper flakes if desired for additional flavor.
05 - Bake for 8-10 minutes until cheese is bubbly and golden with crisp pepperoni edges.
06 - Let cool on the tray for 2-3 minutes to set, then transfer to paper towel-lined plate to absorb excess oil.
07 - Serve warm or at room temperature as a crunchy snack.