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Sugar Cookie Icing That Hardens – Simple, Smooth, And Shiny

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This simple sugar cookie icing dries smooth, shiny, and firm—perfect for decorating cookies with clean lines and vibrant colors. It’s easy to make, customizable, and ideal for both outlining and flooding.

  • Total Time: 10 minutes + drying time
  • Yield: Enough for about 24 cookies

Ingredients

  • 2 cups powdered sugar (confectioners’ sugar), sifted
  • 23 tablespoons milk or water
  • 1 tablespoon light corn syrup
  • 1/2 teaspoon vanilla or almond extract
  • Pinch of fine salt
  • Gel food coloring (optional)

Instructions

  1. Sift powdered sugar into a medium bowl to remove lumps.
  2. Add 2 tablespoons milk or water, light corn syrup, vanilla (or almond) extract, and a pinch of salt.
  3. Whisk until smooth and glossy. Adjust thickness: add more liquid for flooding, or more sugar for outlining.
  4. Divide icing into bowls and color with gel food coloring, if desired. Cover with plastic wrap touching the surface to prevent crusting.
  5. Pipe outlines on cooled cookies and let set for 5–10 minutes. Fill (flood) with thinner icing. Use a toothpick to spread and pop bubbles.
  6. Let decorated cookies dry at room temperature for 8–12 hours before stacking or packaging.

Notes

  • Use almond extract for a bakery-style flavor or swap with lemon juice for a citrus twist.
  • For dairy-free icing, use water or plant-based milk.
  • Add unsweetened cocoa powder for a chocolate version.
  • Store unused icing in the fridge with plastic wrap touching the surface for up to 1 week.
  • Decorated cookies last 5–7 days in an airtight container at room temperature.
  • Author: Amelia
  • Prep Time: 10 minutes
  • Cook Time: 0 minutes
  • Category: Dessert
  • Method: No-Bake
  • Cuisine: American
  • Diet: Vegetarian

Nutrition

  • Serving Size: 1 decorated cookie
  • Calories: 60
  • Sugar: 13g
  • Sodium: 5mg
  • Fat: 0g
  • Saturated Fat: 0g
  • Unsaturated Fat: 0g
  • Trans Fat: 0g
  • Carbohydrates: 14g
  • Fiber: 0g
  • Protein: 0g
  • Cholesterol: 0mg