Place chicken breasts in large pot covered with water, bring this to a boil over high and cook for 20 minutes or until the chicken is no longer pink.
Drain chicken, and finely chop chicken into small bite size pieces. Place in a large bowl and mix in the sour cream, chicken broth and cream of chicken. Mix until combined.
In a second bowl melt the 1/4 cup butter, then mix in the Petridge Farms stuffing until moist.
In a 3-5 quart casserole dish layer the two bowls. First a layer of chicken mixture, then a layer of stuffing, repeat and end with stuffing.
Bake at 350 for 1-1.5 hours. If the top of the crumb layer is browning you can cover the casserole for the remaining time. Since everything is precooked, the goal of cooking is to have the dish heated through, and let the flavors combine.