Gradually add the powdered sugar, half of a cup at a time, making sure to scrap down the sides of the bowl if necessary, until the icing becomes thick.
Add the vanilla extract and beat until soft peaks form.
Place the prepared frosting into an air tight container and leave at room temperature until ready to use. Or place directly in to a frosting bag fitted with a tip and use immediately.
Video
Notes
If you have an aversion to consuming egg whites, you can substitute with Meringue powder which can be purchased at craft stores and anywhere cake decorating ingredients are found.