Need to decorate cookies ASAP but don’t have meringue powder? This easy and quick royal icing recipe will come to your rescue. Made with egg whites from a carton along with powdered sugar, this royal icing is made in about 5 minutes. It dries hard, can be turned into any color, and is perfect to flood or outline these quick cut out sugar cookies. No need to run to a specialty store, you can easily make these cookies in no time!