Chicken Alfredo Stuffed Shells Casserole

• 24 jumbo pasta shells
• 2 cups shredded cooked chicken
• 1 cup ricotta cheese
• 1/4 cup grated Parmesan cheese, plus more for topping
• 1 egg, beaten
• 1 teaspoon garlic powder
• 1 teaspoon Italian seasoning
• 1/2 teaspoon salt
• 1/4 teaspoon freshly ground black pepper
• 3 cups Alfredo sauce, homemade or store-bought
• 1 1/2 cups shredded mozzarella cheese
• Chopped fresh parsley for garnish

Directions: