To make sure this Snickers Fudge recipe is safe, for a gluten-free diet it's important to carefully check the labels of all the ingredients you use. Be sure to choose brands of butterscotch or peanut butter chips that are specifically labeled as gluten free as some brands may include gluten as a filler. Additionally verify that the marshmallow cream you use does not contain any additives or cross-contamination that could potentially contain gluten. Lastly when selecting caramels check that they do not contain any ingredients derived from gluten. Are manufactured in facilities that handle gluten.