Preheat oven to 425 degrees F. Lightly oil a 12-cup muffin tin or coat with nonstick spray.

Working one at a time, lay tortilla on a flat surface. Using an empty can, cut 3-4 medium circles, pressing firmly enough in a rocking motion to cut through the tortilla.

Fit a tortilla circle into each of 12 muffin tins, pressing carefully to make sure there is an opening in the center. Scoop 1 tablespoon pizza sauce into each muffin tin. Sprinkle with mozzarella and Parmesan cheeses, topping with 3 mini pepperonis each.

Place into oven and bake for 10-12 minutes, or until cheese has melted.

Serve immediately.