Preheat your oven to 375°F (190°C). Line a baking sheet with parchment paper or a silicone baking mat.

In a mixing bowl, combine shredded cheddar and mozzarella cheese. Add red chili flakes, smoked paprika, cayenne pepper, garlic powder, onion powder, black pepper, and salt if using. Mix thoroughly to evenly distribute the spices.

Using a spoon or cookie scoop, place small mounds of cheese mixture onto the prepared baking sheet, leaving space between each mound.

Gently flatten each mound slightly with the back of a spoon to ensure even cooking.

Bake in the preheated oven for 7–10 minutes, or until the edges are golden brown and bubbly.

Remove from the oven and allow the crisps to cool on the baking sheet for 5 minutes before transferring to a cooling rack. They will continue to crisp as they cool.

Once fully cooled, serve immediately or store for later.