Crockpot Chicken and Stuffing

1 lb boneless skinless chicken breasts. About 4 small pieces.
1 box Stove Top Stuffing mix
1 jar Heinz Fat Free Chicken gravy
1 cup chopped celery
1 cup chicken broth

Spray the bottom of the crockpot with Pam and lay the chicken at the bottom of the crockpot. Pour the broth over the chicken. In a bowl, mix together the dry stuffing mix, celery, and gravy until slightly moistened. Heap over the chicken in the crockpot. Cook 6-7 hours on low.