These have a wonderful texture - buttery, melt-in-your-mouth soft, yet a little crunchy. The cornstarch makes this shortbread especially tender, while the addition of oatmeal give it a bit of crunch. Using old-fashioned oats instead of quick-cooking will provide more crunch. Recipe by Elinor Klivans. These can be made ahead and frozen up to 3 months. Wrap them tightly with plastic wrap, then seal in a clean plastic/metal container.