Cook manicotti to desired doneness as directed on package. Drain; rinse with cold water to cool. Drain well.
Meanwhile, heat oven to 400°F. In medium bowl, combine all filling ingredients; mix well. Fill each cooked manicotti with vegetable mixture.
Place 1/2 cup spaghetti sauce in ungreased 12x8-inch (2-quart) baking dish. Place filled manicotti over sauce. Pour remaining 1 cup spaghetti sauce over manicotti. Cover tightly with foil.
Bake at 400°F. for 20 to 25 minutes or until bubbly. Uncover dish; sprinkle evenly with cheese. Bake an additional 5 to 8 minutes or until cheese is melted.