Stuffed Shells with Four Cheeses

Ingredients (9 items)

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• 1 (12 ounce) box jumbo pasta shells
• 1 (16 ounce) package cottage cheese
• 1 (15 ounce) container ricotta cheese
• 2 cups shredded mozzarella cheese, divided
• ½ cup shredded Parmesan cheese
• 1 egg
• 2 tablespoons chopped fresh parsley
• salt and ground black pepper to taste
• 3 cups tomato sauce