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How to store kale chips 
Dry the kale thoroughly before making your chips. 
The key to keeping kale chips crispy is to make sure your leaves are totally dry before you prepare them. Use a salad spinner or thoroughly pat them dry with paper towels after washing them.
Remove the stems before preparing your chips. Kale stems contain lots of moisture, don't crisp well, and could make your chips soggy when you store them.