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Close-up of round sugar cookies topped with vibrant, marbled sugar cookie icing that hardens, decorated with sprinkles.

The Ultimate Hardening Royal Icing for Sugar Cookies


  • Author: Alexander Knight
  • Total Time: 10 min
  • Yield: Covers approximately 2 dozen medium cookies
  • Diet: Vegetarian

Description

A simple recipe for royal icing that dries firm and glossy, perfect for decorating stackable sugar cookies.


Ingredients

Scale
  • 4 cups powdered sugar, sifted
  • 3 tablespoons meringue powder
  • 6 tablespoons warm water
  • 1 teaspoon clear vanilla extract
  • 1/2 teaspoon light corn syrup (optional, for extra gloss)


Instructions

  1. In a large bowl, whisk together the sifted powdered sugar and meringue powder.
  2. Add the warm water, vanilla extract, and corn syrup (if using).
  3. Beat with an electric mixer on low speed until combined, then increase speed to medium-high and beat for 5 to 7 minutes until the icing is very stiff and smooth.
  4. Test the consistency. For outlining, the icing should hold a stiff peak. For flooding, add water one teaspoon at a time until the icing flows smoothly from a spoon and returns to itself in about 10 seconds.
  5. Color the icing using gel food coloring, if desired. Mix thoroughly.
  6. Use the icing immediately to outline cookies. Let the outline set for 15 minutes before flooding the centers.
  7. Allow cookies to dry completely at room temperature for 6 to 12 hours until the icing is hard to the touch.

Notes

  • For the firmest results, use only gel or powder food coloring, as liquid colors add too much moisture.
  • If the icing becomes too thick while working, stir in water a few drops at a time.
  • Store unused icing in an airtight container at room temperature for up to two days; do not refrigerate.
  • Prep Time: 10 min
  • Cook Time: 0 min
  • Category: Dessert Decoration
  • Method: Mixing
  • Cuisine: American

Nutrition

  • Serving Size: 1/4 cup prepared icing
  • Calories: 180
  • Sugar: 45
  • Sodium: 5
  • Fat: 0
  • Saturated Fat: 0
  • Unsaturated Fat: 0
  • Trans Fat: 0
  • Carbohydrates: 45
  • Fiber: 0
  • Protein: 1
  • Cholesterol: 0
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