The second time (using the original portion size), I made it with the dehydrated celery flakes, allowing 4 chicken thighs to sit in the rub only 3 hours in an oven-proof bag, then baked in the oven (in the bag) and the taste was so much better even with less marinating time. Place chicken, skin side up, on half of a greased 15x10x1-in. baking pan. Place parsnips and sweet potato in a large bowl; add shallots, caraway seeds and the remaining oil, salt and pepper and toss to combine. Place chicken over vegetables in slow cooker, breast side up. Mix together rosemary, lemon juice, oil, paprika and remaining salt in small bowl; rub over chicken. Cook, covered, on low until a thermometer inserted in thigh reads at least 170° and vegetables are tender, 6-8 hours. Turn off the heat, add half of the roasted tomatillo chile salsa, some additional fresh chopped cilantro and fold in the shredded chicken meat. Season, to taste, with salt and pepper.