Combine ground beef, Parmesan cheese, bread crumbs, water, egg, garlic and salt in medium bowl; shape into 12 meatballs.
Bring Sauce to a boil over medium-high heat in 3-quart saucepan. Gently stir in uncooked meatballs.
Reduce heat to low and simmer covered, stirring occasionally, until meatballs are done, about 20 minutes. Serve over hot spaghetti and sprinkle, if desired, with additional Parmesan cheese.
Cost per recipe*: $8.39.
Cost per serving*: $2.10.
*Based on average retail prices at national supermarkets.