Halve onion lengthwise, and cut into 1/4-inch-thick slices. Cut potatoes into 1/4-inch-thick slices. Place onion in a lightly greased 6-qt. slow cooker; top with potatoes and carrots. Combine broth, next 3 ingredients, 3/4 tsp. salt, and 1/4 tsp. pepper. Pour over vegetables. Combine paprika and remaining 1/2 tsp. salt and 1/4 tsp. pepper; rub over chicken. Arrange chicken on top of vegetables. Cover and cook on LOW 6 hours or until chicken is done and vegetables are tender.