Royal icing

A smooth icing made from egg whites or meringue powder and powdered sugar that dries hard and matte, used to decorate cookies.

Royal icing: Decorated sugar cookies piped with crisp white royal icing details, a piping bag and a bowl of icing beside them
  • Fillings, creams, frostings and sauces

Royal icing is mixed to different consistencies for different jobs: stiff for piping borders, flowers and gingerbread house seams, and thinned with water for flooding the surface of a cookie. A common test is the 10 to 15 second rule: a ribbon drizzled on the surface should disappear in that time for flood icing.

Meringue powder is a safe, shelf-stable stand-in for raw egg whites. Decorated cookies need several hours, often overnight, to dry hard.

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Sources

Written by VanillaGoods in our own words from these sources. Last reviewed October 15, 2026.

  1. Royal icing (Q29263), Wikidata