[header] How to make healthy marshmallow sweet potatoes [title] Peel sweet potatoes, for instance with a potato peeler or knife. [step] A small sharp non-serrated knife, preferably without a pointy point (to protect the user), is a good option. The skin is thin and the potatoes are hard, so take a narrow strip at a time to avoid jamming the knife and also to avoid wasting potato. 
Sweet potatoes are not very easy to peel safely so generally don't let a child do this. [title] Chop the sweet potatoes into disks about an inch thick.