Spray a large crock pot (I use a 7 quart) with non-stick spray. Place cut potatoes and baby carrots in the bottom of crock pot. Lay chicken breasts over the top. Season with salt and pepper.
In a medium bowl, whisk together cream of chicken soup, dry ranch dressing mix and milk. Pour this mixture evenly over the chicken.
Cover with lid and cook on high heat 5 to 6 hours OR on low heat 8 to 9 hours. (*It is important to not remove the lid during the entire cook time.) Top each serving with fresh chopped parsley, if desired. Enjoy!