Storing Baked Cookies: Cool cookies completely in a single layer before storing them. Keep each kind of cookie in a separate container to prevent the flavors from mixing and textures from changing.
Soft cookies should be kept in a container with a tight-fitting cover. Place sheets of waxed paper between layers so cookies won't stick together.
Crisp cookies are best stored in a container with a loose-fitting lid. However, if the weather is humid, use a tight-fitting lid.
Frosted cookies should be stored after the frosting has set. Place waxed paper between layers and stack only two or three layers deep.