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Easy Sugar Cookie Icing That Hardens Perfectly

A white bowl filled with freshly whipped, smooth, and creamy sugar cookie icing.
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This recipe translates professional knowledge into a simple, 4-ingredient sugar cookie icing that sets firm, dries glossy, and is ideal for detailed decorating. Stop struggling with runny frosting; this is the durable glaze you need for perfect holiday cookies.

Ingredients

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  • 4 cups powdered sugar, sifted
  • 3 tablespoons meringue powder
  • 6 tablespoons warm water
  • 1 teaspoon clear vanilla extract

Instructions

  1. In a medium bowl, whisk together the sifted powdered sugar and meringue powder. This step removes lumps and ensures a smooth base.
  2. Add the warm water and vanilla extract to the dry ingredients.
  3. Using an electric mixer on low speed, mix until the ingredients are just combined. Scrape down the sides of the bowl.
  4. Increase the mixer speed to medium-high and beat for 3 to 5 minutes until the icing is smooth, glossy, and holds stiff peaks. This incorporates air for a good set.
  5. To achieve outlining consistency (for borders), add water one teaspoon at a time until the icing falls slowly from the beater.
  6. To achieve flooding consistency (for filling in areas), thin the outlining consistency icing further by adding water a few drops at a time until it flows smoothly off a spoon and disappears back into the bowl surface in about 10 seconds.
  7. Color the icing using gel food coloring, mixing thoroughly until the color is uniform.
  8. Apply the icing to cooled cookies. Let the outline dry for 10 to 15 minutes before flooding the center, or flood immediately if using the one-step method.
  9. Allow the decorated cookies to air dry completely on a flat surface for several hours, or overnight, until the icing is completely hard to the touch.

Notes

  • If you need to skip meringue powder, substitute with 1 large egg white, but be aware that the drying time and final texture may vary slightly.
  • For a high-gloss finish, use clear vanilla extract instead of standard brown vanilla extract.
  • If your icing seems too thick after sitting, stir in a few drops of water. If it is too thin, mix in a tablespoon of sifted powdered sugar.
  • This icing sets firm, making it the best icing for detailed cookies that need stacking or gifting.

Nutrition

Find it online: https://kitchenslang.com/easy-sugar-cookie-icing-that-hardens/