Instead of using bottled ranch dressing, I used the ranch powder and mixed with Nonfat Plain Yogurt, Fat Free Sour Creme, 1 T light mayo and 1/4 skim milk. I had my son taste this after it sat and he said much better than FF bottled dressing. I used this mixture on the potatoes and used fat free Kraft shredded cheddar cheese. My family could not tell that it was low fat at all. Great dish, will make again.