Substitute yogurt powder for confectioners sugar when making royal icing When making treats, I try to make them as appealing as possible and like to decorate them.  I have been looking for an icing recipe that can be used for decoration that doesn't include sugar.  Most of the ones I have found call for yogurt, however they do not harden.  I recently purchased a mix which was yogurt based which worked really well however could get costly if I do a lot of treats.  I was wondering if I used a royal icing recipe and substituted the confectioner's sugar in the recipe with yogurt powder, would it work?
I wonder what those yogurt covered peanut contain? They are sweet but a similar setting agent minus the sugar might do the trick? e.g Agar agar