Instructions

  1. Wrap steak in heavy duty plastic wrap; freeze for 30 minutes.
  2. Unwrap steak; cut steak diagonally across the grain into 1/8 inch thick slices.
  3. Place steak, onion, and next 7 ingredients in a 3 quart electric slow cooker.
  4. Combine flour and broth in a bowl; stir with a whisk until blended.
  5. Add broth mixture to cooker; stir well.
  6. Cover and cook on LOW heat for 8 hours or until tender.
  7. Turn slow cooker off; remove lid.
  8. Let stand 10 minutes;.
  9. Stir in sour cream; blend well.
  10. Serve stroganoff over noodles.