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5 Amazing secrets for sugar cookie icing that hardens

sugar cookie icing that hardens

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You need royal icing that dries rock hard for perfect, stackable sugar cookies. This recipe uses meringue powder to create a glossy, firm glaze ideal for detailed decorating and gifting.

Ingredients

Scale
  • 3 tablespoons Meringue Powder
  • 4 cups Powdered Sugar, sifted
  • 6 tablespoons Water, warm

Instructions

  1. In a large bowl, whisk together the meringue powder and powdered sugar.
  2. Gradually add the warm water while mixing on low speed with an electric mixer.
  3. Once combined, increase the speed to medium-high. Beat for 7 to 10 minutes until the icing is very thick, stiff, and forms sharp peaks.
  4. Test the consistency. If the icing is too thick for piping, add liquid one teaspoon at a time.
  5. If the icing is too thin to harden completely, add one tablespoon of sifted powdered sugar at a time.
  6. Use immediately or cover tightly with plastic wrap pressed directly onto the surface to prevent drying.
  7. Decorate cookies. Allow the icing to air dry completely, which can take several hours depending on humidity.

Notes

  • For coloring, use gel food coloring rather than liquid drops to maintain the icing’s stiffness.
  • This icing dries completely hard, making cookies safe for stacking and shipping.
  • If you do not have meringue powder, you can substitute it with 2 pasteurized egg whites, but results may vary slightly in final hardness.

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