How Far In Advance Can You Make Sugar Cookies With Royal Icing?
Sugar cookies with royal icing can be made as early as one week in advance if kept in an airtight container at room temperature. However, it is recommended to decorate the cookies with the royal icing no more than 2-3 days before serving them as the icing may start to become stale or lose its texture over time. It is important to keep the cookies and icing away from direct sunlight or heat to prevent them from melting or becoming too soft.