Rinse chicken breasts and pat dry; place in Crock-Pot. Add onion and potatoes. In a saucepan, combine remaining ingredients and heat until smooth and hot. Pour over chicken breasts. Cover and cook on low setting for 8 to 10 hours.
Adapted by and edited for Mastercook by Brenda Adams, 8/97. Per serving: 266 Calories; 7g Fat (28% calories from fat); 24g Protein; 19g Carbohydrate; 67mg Cholesterol; 662mg Sodium