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Foolproof Sugar Cookie Icing Recipe That Hardens Perfectly

A plate of heart-shaped sugar cookies decorated with colorful, hardened sugar cookie icing and sprinkles.

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This is the best sugar cookie icing recipe that hardens completely, dries smooth, and gives you a glossy finish ideal for detailed decorating. Make professional-looking cut out cookies every time with this simple, no-fail frosting.

Ingredients

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  • 4 cups powdered sugar, sifted
  • 3 tablespoons meringue powder
  • 6 tablespoons warm water
  • 1 teaspoon vanilla extract
  • 1/4 teaspoon clear vanilla extract (optional, for pure white color)

Instructions

  1. In a medium bowl, whisk together the sifted powdered sugar and meringue powder until fully combined.
  2. Add the warm water and vanilla extract to the dry ingredients.
  3. Beat the mixture with an electric mixer on low speed until the ingredients are incorporated, then increase the speed to medium-high.
  4. Beat for 5 to 7 minutes until the icing is very smooth, glossy, and holds stiff peaks. This whipping action incorporates air, which helps the icing set hard.
  5. If the icing is too thick for outlining, add water, 1/2 teaspoon at a time, until you reach a piping consistency.
  6. If the icing is too thin for flooding, add more powdered sugar, 1 tablespoon at a time.
  7. Separate the icing into bowls if you plan to color it. Add gel food coloring sparingly and mix until the color is uniform.
  8. Use the icing immediately for outlining cookies. Let the outline dry for 15 to 30 minutes before flooding the center with thinner icing.
  9. Allow the decorated cookies to air dry completely at room temperature for several hours, or until the icing is hard to the touch.

Notes

  • For a glossy sugar cookie frosting that dries smooth, avoid using too much liquid. The meringue powder is key to achieving a hard set.
  • If you need a corn syrup free cookie icing, this recipe works well as it relies on meringue powder for structure.
  • To make the icing smooth for beginners, strain the mixture through a fine-mesh sieve after mixing to remove any lumps.
  • For holiday sugar cookie frosting, divide the batch and use concentrated gel colors for deep, vibrant shades.

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