Cheese-Stuffed Shells

Ingredients

• 1 lb bulk Italian sausage
• 1 large onion, chopped
• 1 (10 ounce) package frozen chopped spinach, thawed and well drained
• 1 (8 ounce) package cream cheese, softened
• 1 egg, beaten
• 2 cups shredded mozzarella cheese, divided
• 2 cups shredded cheddar cheese
• 1 cup cottage cheese
• 1/4 cup grated parmesan cheese
• 1/4 teaspoon salt
• 1/4 teaspoon pepper
• 20 jumbo pasta shells, cooked and drained
• Sauce
• 1 (29 ounce) can tomato sauce
• 1 tablespoon dried onion flakes
• 1 1/2 teaspoons dried basil
• 1 1/2 teaspoons parsley flakes
• 2 cloves garlic, minced
• 1 teaspoon dried oregano
• 1/2 teaspoon salt
• 1/4 teaspoon pepper