Add the rice, cream of chicken soup, cream of mushroom soup, chicken stock, garlic, and black pepper to the crock pot. Stir to combine.
Place the chicken breasts on top of the rice mixture.
Sprinkle the onion soup mix and parsley over the chicken.
Cover the crock pot and cook on HIGH for 3½ hours or LOW for 5-6 hours. No peeking!
Once the chicken is cooked through and tender, serve while hot. Enjoy!