In 3-quart saucepan, cook spaghetti as directed on package. Drain; return to saucepan.
Meanwhile, heat oven to 400°F. Spray 13x9-inch (3-quart) glass baking dish with cooking spray.
Stir pasta sauce into cooked spaghetti. Pour into baking dish, spreading evenly to cover bottom of dish. Arrange frozen chicken nuggets in single layer over spaghetti mixture.
Bake uncovered 8 minutes. Remove from oven. Turn chicken nuggets over; sprinkle cheese over top.
Return to oven; bake 6 to 8 minutes longer or until chicken is thoroughly heated and cheese is melted.