In a 4-quart Dutch oven, cook turkey, garlic and onion until turkey is no longer pink. Stir in remaining ingredients. Bring to a boil, reduce heat and simmer, uncovered, 1 hour. Serve over spaghetti, if desired.
In a 2 1/2-quart microwave-safe dish, combine turkey, garlic and onion. Microwave on high 4 to 6 minutes or until no longer pink. Stir in remaining ingredients. Microwave, covered, 10 to 12 minutes, stirring twice. Let stand 3 minutes before serving.