Arrange the chicken breasts in the crockpot. Optionally, filet them for faster cooking. Season thoroughly with garlic salt.
In a mixing bowl, combine the cream of chicken soup with the sour cream until well blended. Pour this mixture evenly over the chicken in the crockpot.
Sprinkle the dry stuffing mix on top of the chicken and soup mixture.
Layer the frozen green beans over the stuffing.
Cover with the crockpot lid and cook on high for 3-4 hours or on low for 6-8 hours, until the chicken is tender and easily shredded.