Serve it tonight: Combine first 7 ingredients in a greased slow cooker. Cook on low 8-10 hours. Combine sour cream and cornstarch, mix well. Stir into ingredients in slow cooker until well blended. Cook, covered, on high 15-20 minutes or until sauce thickens. Spoon beef mixture over hot egg noodles. Makes 4-5 servings.
Serve it later: Combine first 7 ingredients in a large resealable bag; freeze until ready to serve. Thaw completely; prepare as directed above.