Parmesan Chicken Shells

Ingredients

• 1 1/2 cups ricotta cheese
• 1 egg
• 1/2 teaspoon parsley
• 1/4 teaspoon garlic powder
• 1/8 teaspoon oregano
• 1/8 teaspoon pepper
• 3/4 cup grated Parmesan cheese
• 2 cups shredded Mozzarella cheese, divided
• 2 cups cooked chicken, shredded
• 3 cups spaghetti sauce
• 16 jumbo shells, cooked and drained