3 Egg Whites (at ROOM TEMPERATURE)
3 1/2-4 cups Powdered Sugar
1/2 tsp Cream of Tartar
1 tsp Vanilla Extract
1. Add all the ingredients to a clean, dry bowl and whip with the whisk attachment on your mixer. This will take some time– so be patient! To get an icing that pipes well and will stay put, make sure that when you turn the whisk upside down, a stiff peak stands straight up.
2. Pipe icing onto the cookies (I just use a sandwich bag that I’ve cut the tip off of).