One of the most difficult parts of having your whole family eating gluten free is learning how to bake again. Baking gluten free can be tricky scratch. My oldest daughter found this recipe for http://www.sumptuousspoonfuls.com/soft-chewy-gluten-free-sugar-cookies/ They are hands down the best gluten free cookies I have tasted. I think this recipe would work for making decorated holiday cookies.
Peace, Health & Joy,