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Ingredients:

1 lb frozen boneless skinless chicken breast
1 (10 1/2 ounce) can fat-free cream of mushroom soup
16 ounces fat free sour cream
1 (1 1/4 ounce) envelope dry onion soup mix

Directions:

1 Put frozen chicken in bottom of crock pot.
2 Mix soup, sour cream, and onion soup mix.
3 Pour over chicken.
4 Cook on low for 7 hours (or high for 4 hours).
5 Serve over rice or noodles.

source:     http://www.food.com/recipe/chicken-stroganoff-crock-pot-18651