01 - Rub the chicken all over with olive oil, salt, pepper, paprika, thyme, and rosemary, ensuring even coverage.
02 - Place carrots, potatoes, celery, onion, and garlic in the bottom of the crockpot, distributing evenly.
03 - Set the seasoned whole chicken on top of the vegetables. Add the bay leaf and pour the chicken broth around the chicken, avoiding pouring directly over it.
04 - Cover and cook on LOW for 6–7 hours, or until the chicken reaches an internal temperature of 165°F and vegetables are fork-tender.
05 - Carefully transfer the chicken and vegetables to a serving platter using tongs. Remove and discard the bay leaf.
06 - Pour the cooking liquid into a saucepan. Mix cornstarch and cold water until smooth, then whisk into the liquid. Bring to a simmer over medium heat, stirring constantly until thickened (2–3 minutes).
07 - Carve the chicken into portions and serve with vegetables and gravy if desired.