My county won't allow meringue powder in the icing - because it contains eggs. I think they are wrong on their reasoning, but since I am not a scoff law, I use an alternative aquafaba (chick pea brine). There are numerous recipes out there and a Facebook page devoted to the miracle liquid. Very popular with vegans. Here is a link to the recipe I use...I actually think it tastes better than the regular royal with eggs. You should play with it first and see if you like it. Thin with water for flooding, etc. I find it tends to be a bit too wet according to the recipe - adjust as you see fit. Good luck...