To keep cookies from spreading it helps to chill the dough before baking and the percentage of protein in the flour is a major culprit of flat cookies. If unglazed, store in an airtight container at room temperature for 5-6 days. Glazed cookies should be stored in a single layer for 3-4 days. Refrigerating will extend their shelf life to 7 days. Can be frozen for up to 4 weeks.