1Cook and drain spaghetti as directed on package.
2Meanwhile, in 12-inch skillet, cook sausage and onion over medium heat until sausage is no longer pink, stirring occasionally and breaking sausage into small chunks. Add bell pepper and zucchini; cook and stir until vegetables are crisp-tender, about 2 minutes. Drain, if desired.
3Stir pasta sauce into sausage mixture; heat to boiling over medium heat.
4To serve, place 3/4 cup spaghetti on each of 4 plates. Top each with 1 cup meat sauce and 2 tablespoons cheese.