Crock Pot Chicken Stroganoff

1 can cream of mushroom soup (fat-free is fine)
16 oz sour cream (fat free is fine)
1 envelop Lipton onion soup mix
1-4 lb. frozen skinless boneless chicken breasts

1. Spray crockpot with nonstick cooking spray.  Put chicken breasts in crockpot.  Cover with other ingredients.  
2. Cook on low for 7 hours.
3. Shred the chicken with forks and stir back into sauce.
4. Serve over noodles if desired. 

*4 Weight Watchers POINTS per serving if you use all fat free ingredients