If you have marshmallows that have gotten old, stale, and hard all you have to do to make them soft again is to place them in a resealable plastic bag with a slice of bread. Let them stand until soft, which usually takes 1 or 2 days. Then you can remove the bread and the marshmallows should be soft again.
you can put the marshmallows in the microwave for a few mins they will get soft or save the hard ones for hotchoc.
What a great hint! I had never heard of this so retrieved two small dabs of rock-hard mini marshmallows from the back of the pantry and tried this idea. It worked! I can tell already with just an overnight try that this is going to work beautifully. Thanks!
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How can I soften up marshmallows that have become hard?
Try putting a fresh slice of bread in the bag overnight. I know it works for cookies and rolls, it might work for marshmallows too. Cant hurt.