"This is my favorite mashed potato recipe. These mashed potatoes taste as if they contain a great deal more fat than they do. I use buttermilk to mash the potatoes because it has a natural creaminess yet is far lower in fat than milk or cream, and I add a small amount of butter at the end, only after the potatoes have absorbed the liquid. The butter stays on the surface of the potatoes, its flavor readily discernible, imparting a truly rich finish. Be sure to us..."