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Top view of a heart-shaped cookie with thick reflective blush pink icing and white pearls. (Sugar Cookie Icing That Hardens)

Sugar Cookie Icing That Hardens: The Secret to a High-Gloss Professional Finish

This Sugar Cookie Icing That Hardens delivers a thick, smooth, and highly glossy light pink finish. Perfect for heart-shaped cookies, it sets firmly for stacking while maintaining a soft bite and reflective sheen.
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Prep Time 15 minutes
Total Time 15 minutes
Servings: 24 cookies
Course: Decorating, Dessert
Cuisine: American
Calories: 110
Ingredients Equipment Method Notes

Ingredients
  

Core Ingredients
  • 4 cups Powdered Sugar Sifted (480g)
  • 3 tbsp Whole Milk Or heavy cream (45ml)
  • 2 tbsp Light Corn Syrup For gloss (30ml)
  • 1 tsp Clear Vanilla Extract (5ml)
  • 1 drop Pink Gel Food Coloring Blush pink
  • 1/8 tsp Fine Salt (0.75g)
  • 2 tbsp White Sugar Pearl Sprinkles For topping

Equipment

  • 1 Sifter To ensure lump-free powdered sugar.
  • 2 Piping Bags For outlining and flooding.
  • 1 Scribe Tool For popping air bubbles.

Instructions
 

Mixing the Icing
  1. In a large bowl, whisk together the sifted powdered sugar and milk until a thick paste forms.
  2. Slowly stir in the light corn syrup, clear vanilla, salt, and pink gel coloring. Mix by hand with a spatula to avoid creating air bubbles until the icing is smooth and glossy.
Decorating the Cookies
  1. Transfer icing to a piping bag. Pipe a border around the heart-shaped cookies, leaving the golden edges visible.
  2. Immediately fill the center of the heart with icing. Use a scribe tool to pop bubbles and smooth the surface.
  3. Wait 60 seconds, then scatter white sugar pearl sprinkles evenly over the wet icing.

Notes

Wait at least 24 hours before stacking cookies to ensure the icing has hardened completely.
If the icing is too thick, add milk 1/2 teaspoon at a time.
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