Royal Frosting

Both recipes are great for gingerbread houses!

Royal Frosting
With egg whites:
3 egg whites, room temperature
1/2 tsp cream of tartar
1 lb powdered sugar

With meringue powder:
3 TB meringue powder
1 lb (4 cups) powdered sugar
6 TB warm water

Beat all ingredients until icing forms peaks (7-10 minutes at low speed with a heavy-duty mixer, 10-12 minutes at high speed with a hand-held mixer).