Combine flour, garlic powder, pepper and paprika in slow cooker. Cut beef into 1-1/2 inch by 1/2 inch strips. Place in flour mixture and toss until thoroughly coated.
In medium bowl, combine cream of mushroom soup, water and onion soup mix. Stir until well blended. Pour into slow cooker and mix with beef. Add mushrooms and stir.
Cover slow cooker and cook on HIGH 3 1/2 hours or LOW 6-7 hours.
Stir in sour cream and cook on HIGH 10-15 minutes or until heated through. We like it served with brown rice or egg noodles! ENJOY!!
Notes
NOTE: Nutrition calculations are made on My Fitness Pal app and do not include brown rice or egg noodles, etc.