Pat chicken dry with paper towels. Place potatoes, carrots, and onion in slow cooker. Top with chicken, overlapping slightly.
Mix Gravy Mixes, water, seasoned salt, thyme, and poultry seasoning in small bowl. Pour mixture over chicken and vegetables. Cover.
Cook 8 hours on LOW or 4 hours on HIGH or until chicken is cooked through and vegetables are tender.
Place chicken and vegetables in serving dish. Stir sour cream into drippings in slow cooker with wire whisk. Pour over chicken and vegetables.
