Place chicken breasts (or cooked chicken) into the Crockpot.
Sprinkle ranch dressing mix, garlic powder, and pepper evenly over the chicken.
In a bowl, combine cream cheese, cream of chicken soup, and milk (or broth). Mix until smooth, then pour over chicken.
Cover and cook on Low for 6 hours or High for 3 hours, until chicken is tender.
Shred chicken using two forks right in the Crockpot and stir well to combine with the sauce.
Optional: Add cheese, or vegetables. Stir and cook for another 10 minutes.
Garnish with parsley and serve warm over rice, noodles, or potatoes.