Marshmallows get sticky in an opened bag because moisture fills their air pockets, making them collapse. To keep them fresh:
- set the opened bag in a container with a tight-fitting lid or in a freezer-safe plastic bag
- avoid packing too many marshmallows together
- seal the container securely
- store in the freezer for up to four months
To use them, remove the bag from the freezer and set them on the counter for 10-15 minutes at room temperature before using so they can defrost.
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