Sweet And Tangy Chicken

8 boneless, skinless chicken breast halves
2 18 oz. bottles prepared barbecue sauce
15 oz. can pineapple chunks, juice reserved
1 medium green bell pepper, sliced
1 medium onion, chopped
2 cloves garlic, minced

Place 4 chicken breasts in crockpot. Combine other ingredients, except remaining chicken, in large bowl; mix well. Pour half of sauce mixture over chicken already in crockpot. Layer the other 4 chicken breasts over sauce mix; Pour on remaining sauce. Cover; cook on low for 8 to 9 hours.