You don’t let them cool
Rule #1 of cookie storage: let them cool completely. Make sure to leave an hour or two between the end of your bake time and packing up your cookies. Excess heat equals excess moisture, which results in soggy, sticky (or even moldy) cookies.
You use a cookie jar
Yes, they’re adorable and classic. But do cookie jars keep cookies fresh? Nope. Instead, opt for an airtight container that will seal in freshness and preserve the texture you intended for your homemade desserts.
You stack frosted cookies
Even if they are completely cooled, frosted cookies should never be stacked on one another. You’ll end up with a stuck-together mess. Preserve your decorated cookies by setting them all out in one layer, wrapping them individually or by using parchment or waxed paper between layers of cookies.
You store different types together
No one wants to taste gingerbread when they bite into a chocolate chip cookie. Flavor contamination aside, you don’t want to mix textures. Crisp cookies will get soggy and lose their snap, while soft, chewy cookies will give up their moisture. Package one type of cookie per container—no more.
You microwave frozen cookies
A microwave’s heat is too inconsistent to trust your precious cookies in its care. Instead, thaw frozen cookies at room temperature or throw them in a 350°F oven for 3-5 minutes to freshen them up.
You freeze the wrong things
Some things just aren’t meant to be frozen. Namely, delicate cookies such as meringues, as well as cakey cookies like madeleines. Plan to serve and share these right away—they’re much better (and prettier) fresh. Learn more about freezing cookies the right way.
You skimp on padding
This applies especially if you’re shipping cookies, or if they’ll be in the car with you for a longer distance. Jostling around in a box can ruin delicate cookies (like pizzelle) in no time. Protect them with tissue paper to keep them looking and tasting perfect.
You keep them too long
If you’ll be keeping them at room temperature (in that airtight container), three to five days is as much time as you get. But in the freezer, you can keep your cookies for up to 6 months. This is how long different kinds of cookies last.