I have someone that wants to order cookies from me, but her daughter is allergic to alot of things, including, milk, eggs, nuts, soy and wheat.
instead of sugar cookies I was going to do shortbread, but I need an icing that I can get good detail with like royal icing, but no dairy or eggs, and meringue powder has dried egg whites.
I've used a glaze like this before (you could use water instead of milk, if the child can have corn syrup) and it takes a little longer to dry than royal but it does dry firm enough to package up. You can make it thicker or thinner depending how much liquid/sugar you use.
Have you found a good gluten-free, egg-free, dairy-free shortbread recipe??? If you do, I'd love to have it. I've been experimenting with allergen-friendly cookie recipes for a family member who is allergic to just about everything, and I've not had much success.