My MMF is crumbly and keeps breaking apart, I have tried adding shortening and also tried adding powered sugar. Neither of these worked. Any cures?
Warm sample in the microwave a few seconds at a time then knead it and see if that helps.
Warming in the microwave is a good trick. You can also add a tablespoon of water at at time, not too much and knead it well. Did you use a name brand marshmallow? I found store brands to be a bit more dry and do not make a good MMF. Good luck!