Zesty Barbecue Chicken

6 frozen skinless, boneless chicken breast halves
1 (12 ounce) bottle barbecue sauce
1/2 cup Italian salad dressing
1/4 cup brown sugar
2 tablespoons Worcestershire sauce

Place chicken in crock pot.

In a bowl, mix the barbecue sauce, Italian salad dressing, brown sugar and Worcestershire sauce. Pour over the chicken. Cover, and cook for 3 to 4 hours on HIGH or for 6 to 8 hours on LOW.