Cheese-Stuffed Shells

Ingredients

• 1 pound bulk Italian sausage
• 1 large onion, chopped
• 1 package (10 ounces) frozen chopped spinach, thawed and squeezed dry
• 1 package (8 ounces) cream cheese, cubed
• 1 large egg, lightly beaten
• 2 cups shredded part-skim mozzarella cheese, divided
• 2 cups shredded cheddar cheese
• 1 cup 4% cottage cheese
• 1 cup grated Parmesan cheese
• 1/4 teaspoon salt
• 1/4 teaspoon pepper
• 1/8 teaspoon ground cinnamon, optional
• 24 jumbo pasta shells, cooked and drained
• 1 can (29 ounces) tomato sauce
• 1 tablespoon dried minced onion
• 1-1/2 teaspoons dried basil
• 1-1/2 teaspoons dried parsley flakes
• 2 garlic cloves, minced
• 1 teaspoon sugar
• 1 teaspoon dried oregano
• 1/2 teaspoon salt
• 1/4 teaspoon pepper