I wanted to make SMBC using powdered egg whites, I cant figure out how exactly I supposed to do it. Do I add the sugar and whip it up when I whip the egg white powder? Do I add it after Ive already whipped the whites? Will it fully dissolve or will there be granuals left in the icing?

A recipe with measurements would be wonderful! I cant find one using powdered egg whites anywhere...


Thank you!