Cook pasta shells as directed, drain and cool. Heat oven to 350. Spray a 9" x 13" baking pan w/ cooking spray. In lg bowl, combine ricotta cheese, 2 cups mozzarella cheese, 1/2 cup parmesan cheese, eggs, parsley, garlic, salt and pepper.
Mix well. Stir in crumbled sausage. Spread 1 cup pasta sauce into bottom of pan. Spoon about 2 tbsp cheese mix into each pasta shell. Place filled shells in pan.
Pour remaining pasta sauce over shells. Cover w/ foil and bake 40 mins. Uncover and sprinkle w/ remaining mozzarella cheese and parmesan cheese. Bake, uncovered for 12 mins more, or until cheese is melted.