Put a little cornstarch or powdered sugar in the bag of marshmallows if they are stuck together. Then pull them apart with your hands. They should come apart more easily and be less likely to stick together the next time you go to use them.
You could put a piece of bread in the bag which adds moisture ... much the same as doing with brown sugar that's hard.
When I buy a bag of marshmallows, I open them as soon as I get them home, and transfer them to a large zip lock bag. Throw a couple tablespoons of powdered sugar in and shake well. They will stay soft for months, and never stick together. Don't wait until they are stuck.
Harlean from Arkansas
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