Cream puff shells keep about two days in the refrigerator when stored in an airtight container lined with a paper towel. Freezer storage increases the shelf life to about one month. Even when properly stored, cream puffs lose their crisp texture and need reheated prior to serving.
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Cool the cream-puff shells on a baking rack until they reach room temperature and wrap them tightly in plastic wrap. Slide the wrapped shells in a heavy-duty freezer bag and keep them in the freezer up to one month.
Crisping Cream-Puff Shells
Heat the oven to 300 degrees Fahrenheit and take the cream puffs out of the refrigerator or freezer. Let the shells reach room temperature and heat them on a sheet pan until crispy, five to eight minutes. Let the shells cool to room temperature before you fill them.