This avocado lime ranch dressing is a Chick-fil-A copycat recipe. This version has no sugar added, is half the calories of the original and is made with buttermilk, avocado, fresh cilantro, spices and lime for a tangy, zesty twist on a classic salad dressing. Dairy-based salad dressings will last in the refrigerator for up to one week. Try using freshly opened sour cream and buttermilk to help it last as long as possible. —Kelsey Reddick Smith, Knoxville, Tennessee