Slow Cooker Chicken Barbecue

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

1.Put chicken in slow cooker.
2.Mix all other ingredients in a bowl and pour over chicken.
3.Cover and cook 3 to 4 hours on high or 6 to 8 hours on low.

* Use a molasses based barbecue sauce - not vinegar based.