Most flours are made from wheat. But all flours are not the same. If a recipe, such as soft layered cakes, calls for cake flour instead of the all-purpose flour you have in your pantry, follow this easy recipe. You can whip up a batch of this light, airy flour in no time. The addition of cornstarch to a scant cup of all-purpose flour will mimic the result of cake flour; it won't be exactly the same, but it will yield a softer, more delicate crumb.