Cook sausage and onion in a 3 quart saucepan over medium heat for 8-10 minutes. Stir occasionally until sausage is no longer pink.
Stir in remaining ingredients, breaking up the tomatoes.
Heat to boiling; reduce heat to low. Cover and simmer for 5 minutes or until the zucchini is tender.
Sprinkle each serving with Parmesan cheese, if desired.
Submitted by: Bridgett