Preheat your oven to 400°F. Line a baking sheet with parchment paper. Mix the Parmesan cheese with the garlic powder and onion powder (if using).
Spoon 1 tablespoon heaps of the grated cheese onto the prepared baking sheet in 12 small piles, leaving about 1 inch between each. Lightly flatten each mound with a spoon to form small rounds.
Bake for 4 to 8 minutes, or until the edges are golden and crispy. Remove from the oven and let cool on the baking sheet to crisp up further.