Cook pasta according to package directions. Meanwhile, in a small bowl, combine the ricotta cheese, 1/4 cup mozzarella cheese, carrot, zucchini, Parmesan cheese, parsley, oregano, garlic powder, pepper and salt to taste.
Spread 1/4 cup spaghetti sauce in a 3-cup baking dish coated with cooking spray. Drain shells; stuff with cheese mixture. Place in prepared baking dish. Top with remaining spaghetti sauce.
Cover and bake at 350° for 25 minutes. Uncover; sprinkle with remaining mozzarella. Bake 10-15 minutes longer or until bubbly.