Keto Pizza Casserole

Name: Keto Pizza Casserole
Prep time: 10 min
Cook time: 15 min
Total time: 25 min
Cuisine: American
Ingredients: 3 large chicken breasts (cooked; shredded or diced (about 30 ounces raw, 22 ounces cooked)); 1 oz pepperoni (diced (about 15 slices)); 1 ½ cups pizza sauce; ½ teaspoon garlic powder; ½ teaspoon dried oregano; ½ teaspoon red pepper flakes; 1 cup shredded mozzarella ((4 ounces)); 2 tablespoons Parmesan (dry-grated ); ¾ cup mozzarella (shredded (3 ounces)); 1 ½ oz pepperoni ((about 20 slices))