Instructions: 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.

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