To enjoy Skinny Cow’s limited-edition low-fat frozen shake, add skim milk, wait one minute, stir, and then enjoy. These shakes are available in two flavors, when using skim milk White Mint Cookie contains 220 calories, 2.5 grams of fat and 5 grams of fiber  and Double Chocolate Crumble with 230 calories, 2.5 grams of fat and 6 grams of fiber.