In a mixing small bowl, combine the grated parmesan cheese, egg whites, garlic powder (optional). Mix together well until it forms to a sticky dough.
Roll the dough to about 1-inch in diameter and freeze in a parchment lined sheet tray for 2 hours.
Air fry at 400°F for 8 to 10 minutes. Bake in an oven at 400°F for 15 to 20 minutes. Remove from heat and let stand for a minute. (Optional: drizzle with olive oil, parsley, serve with Marina sauce) and Devour!