Slow Cook:6 hrs to 7 hrs (low) or 3 3 1/2 hours (high)
Place onion in a 3 1/2- or 4-quart slow cooker. Add chicken; sprinkle with salt and pepper. Snip any large pieces of chutney. In a small bowl, combine chutney, barbecue sauce, and curry powder. Pour over chicken.
Cover and cook on low-heat setting for 6 to 7 hours or on high-heat setting for 3 to 3 1/2 hours.
If desired, toss rice with chopped mango and/or green onion. Serve chicken and chutney mixture over rice.