Allow cookies to cool completely before storing.
Store soft cookies and crisp cookies in separate airtight containers. If stored together, the moisture from the soft cookies will soften the crisp cookies, making them lose their crunch.
Flavors can also blend during storage, so don't store strong-flavored cookies with delicate-flavored ones.
Layer cookies in a container, separating each layer with waxed paper.
Allow icing on cookies to completely dry before storing.
Unfrosted cookies can be stored in a cool dry place in airtight containers for about 3 days. Cookies topped with a cream cheese frosting should be stored in the refrigerator.
For longer storage, wrap unfrosted cookies in plastic wrap, stack in an airtight container, seal and freeze for up to 3 months, Thaw wrapped cookies at room temperature before frosting and serving.
If your crisp cookies became soft during storage, crisp them up by heating in a 300° oven for 5 minutes.