Serving and Storing - Let these cookies cool 5 minutes before transferring to a wire cooling rack. When they come out of the oven they are fairly crumbling. They will harden as they cool. Store leftover cookies in an airtight container at room temperature for up to 5 days. You can also freeze these cookies for up to 2 months. When ready to serve, remove them from the freezer for at least 2 hours prior to let them thaw completely.