Here's one I found on www.recipezaar.com. I made it last night and it was incredible....the sauce was very flavorful. I used frozen, bone-in(about 8 oz each), skinless breasts but you could probably use just about any cut you wanted.
The odd thing is, I cooked my chicken for 8 hours on low thinking that would barely be enough time since the chicken breasts were huge, frozen, and still on the bone. Interestingly enough, they came out a little dry. Next time I make this, I am going to do them on low for 6 1/2 hours.
At any rate, the sauce is incredible. It's not thick, but you could probably thicken it up with cornstarch if you wanted. The best part about it is how it marinates the chicken as it cooks. The chicken absorbs a lot of flavorful sauce.
Garlic and Brown Sugar Chicken
4 chicken breasts halves on bone, skinned
1 cup packed brown sugar
2/3 cup vinegar
1/4 cup Sprite
2-3 tablespoons minced garlic
2 tablespoons soy sauce
1 teaspoon pepper
Place chicken in crockpot. Mix all remaining ingredients and pour over chicken. Cook on low for 8 hours.