Dough is prepared in a log or loaf and baked one time. It is allowed to cool briefly, then sliced and rebaked to create a crisp cookie.
- Prepare the dough as directed.
- Pipe the dough or form it into logs or loaves.
- Bake until the internal structure is set but the color is not fully developed.
- The logs are generally allowed to cool briefly but not completely, so that they won’t be too brittle when sliced. Slice the cookies using a serrated blade. A serrated blade is less likely to chip and fray the edges of the cookies as they are sliced.
- Arrange the sliced cookies on sheet pans.
- Bake the cookies again, at a lower temperature. This will dry them fully and develop more flavor and color; any seeds and nuts will toast at this point and the sugars in the dough will caramelize.
- Cool and store. Twice-baked cookies have a long shelf life due to the lack of moisture that results from being dried in the oven during the second baking.