Place the frozen chicken breasts in a 4 to 6 quart slow cooker.
Pour barbecue sauce over chicken, making sure the chicken is covered in the sauce.
Add drained can of pineapple chunks on top.
Cover and cook for 2 to 3 hours on HIGH or 4 to 6 hours on LOW.
Serve whole chicken breasts with favorite side dish and enjoy!
Notes
This recipe uses frozen boneless skinless chicken breasts. If all you have is thawed chicken adjust the cooking time by about 1 hour less. So cook instead for 1 to 2 hours on HIGH or 3 to 5 hours on LOW.