I "tweeked" this recipe from one I found online. Enjoy!
4 frozen boneless, skinless chicken breasts or 12 frozen chicken tenders
1 can cream of chicken soup
1 4oz. can of mushrooms, drained
8 oz. sour cream
1 T. creole or grey mustard
2 T. parsley flakes
1 envelope of dry onion soup mix
1 tsp. black pepper
(1 T. cornstarch) if needed
Spray crock pot with cooking spray. Add chicken. Mix all other ingredients except cornstarch in bowl until smooth. Pour over chicken. Cook for 6 hours on low. I use a spoon to break up the chicken into smaller pieces prior to serving over rice or noodles. If you think your gravy is too thin, add 1 T. cornstarch, mixing well, one hour prior to serving.