In bowl, combine ground beef, bread crumbs and egg.
Shape into 20 1-1/2" balls; place on baking sheet.
Bake at 375° for 25 mins; drain. In large saucepan,
saute onions in oil until tender. Stir in remaining
ingredients except cheese and spaghetti. Simmer while
meatballs bake. Add drained meatballs to pan; simmer,
covered, an additional 20 mins. Stir in cheese and
serve over spaghetti.