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Foolproof Royal Icing vs. Hardening Sugar Cookie Icing: Master Both Textures for Perfect Cookie Decorating

Close-up of several cross-shaped sugar cookies decorated with bright, hardened cookie icing and sprinkles.
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Learn the best cookie icing recipes to achieve smooth, glossy finishes that dry hard. We cover both Royal Icing using meringue powder and classic sugar cookie icing that hardens perfectly for durable, professional cookie decorating.

Ingredients

Scale
  • 3 cups powdered sugar, sifted
  • 4 tablespoons meringue powder
  • 6 tablespoons warm water (approximate)
  • 1 teaspoon clear vanilla extract (optional)

Instructions

  1. In a medium bowl, combine the sifted powdered sugar and meringue powder. Whisk them together thoroughly to break up any lumps.
  2. Add the warm water slowly, about one tablespoon at a time, while mixing with a hand mixer or stand mixer on low speed.
  3. Once the water is incorporated, increase the speed to medium-high and beat for 5 to 7 minutes until the icing is very smooth and holds stiff peaks. This creates the base for piping consistency.
  4. For flooding consistency, add water 1/2 teaspoon at a time until the icing flows smoothly off a spoon but still holds a visible line on the surface for about 10 seconds.
  5. For decorating, separate the icing into bowls and mix in gel food coloring until you achieve your desired shade.
  6. Use the icing immediately for piping details or flooding cookies. If the icing thickens while working, add a few drops of water to restore the correct consistency.
  7. Allow decorated cookies to dry uncovered at room temperature for several hours, or overnight, until the icing is completely hard to the touch.

Notes

  • To achieve a rock-hard, glossy finish, use only clear vanilla extract or almond extract, as brown extracts can affect the color and texture.
  • If your icing seems grainy, beat it longer. If it is too thin, add powdered sugar one tablespoon at a time.
  • For a quick, beginner-friendly sugar cookie icing that hardens, substitute the meringue powder with 1 egg white and 1/2 teaspoon of cream of tartar, but note that this version requires refrigeration.
  • Store unused royal icing in an airtight container at room temperature for up to two weeks, pressing plastic wrap directly onto the surface to prevent a crust from forming.

Nutrition

Find it online: https://cookingbyfelix.com/best-cookie-icing-recipe-hardens-smoothly/