I want to make gingerbread house, but I can't find a recipe for royal icing using dried egg whites...I guess so that it is kinda thick so they can use as glue.
Try Antonia74 Royal Icing (search recipes), it uses meringue powder instead of egg whites....I LOVE it!!
Royal Icing for Gingerbread Houses:
I just use the recipe that comes with the wilton meringue powder. I think it is something like 1lb powder sugar, 3 tbsp water and 3 tbsp meringue powder, but I am not postive.