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Glossy Sugar Cookie Icing That Hardens Firmly

Two round sugar cookies topped with thick, glossy white sugar cookie icing that hardens.
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Learn to make bakery-style sugar cookie icing that dries quickly to a smooth, hard, glossy finish, perfect for detailed decorating and stackable cookies.

Ingredients

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  • 2 cups powdered sugar, sifted
  • 3 tablespoons milk (whole or plant-based)
  • 1 tablespoon light corn syrup
  • 1 teaspoon vanilla extract
  • Gel food coloring (optional)

Instructions

  1. In a medium bowl, combine the sifted powdered sugar, milk, light corn syrup, and vanilla extract.
  2. Mix with a whisk or electric mixer on low speed until the ingredients are just combined. Do not overmix at this stage.
  3. If the icing is too thick for outlining, add milk, one teaspoon at a time, until you reach the desired consistency. If it is too thin, add more sifted powdered sugar, one tablespoon at a time.
  4. For flooding consistency, the icing should flow slowly off the whisk, leaving a trail that disappears after about 10 seconds.
  5. If coloring the icing, divide it into separate bowls and mix in gel food coloring until the color is uniform.
  6. Use the icing immediately for outlining cookies. Let the outline set for 5 to 10 minutes before filling (flooding) the center areas.
  7. Allow the cookies to dry completely at room temperature. This hard setting process can take 4 to 8 hours, depending on humidity. For best results, allow 12 to 24 hours for a fully durable, stackable finish.

Notes

  • For the hardest, glossiest finish, light corn syrup is key; do not skip it.
  • If you need the icing to dry faster, place the decorated cookies in a dry area with good air circulation, away from direct heat or sunlight.
  • This recipe creates a reliable, non-cracking sugar cookie icing ideal for holiday cookie decorating.
  • If you need a thinner consistency for fine detail work, add a few drops of water instead of milk.

Nutrition

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