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The Best Sugar Cookie Icing Recipe: Smooth, Glossy, and Hardens Perfectly

Close-up of a square of yellow cake topped with vibrant blue cookie icing recipe, resting on a wooden cutting board.
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This is the foolproof cookie icing recipe you need for decorating cut-out sugar cookies. It mixes easily, dries to a smooth, glossy finish, and hardens firm enough for stacking and gifting.

Ingredients

Scale
  • 4 cups confectioners’ sugar, sifted
  • 1/2 cup milk or water (use milk for a slightly softer set)
  • 2 tablespoons light corn syrup
  • 1 teaspoon vanilla extract

Instructions

  1. In a medium bowl, whisk together the sifted confectioners’ sugar and the milk or water until smooth.
  2. Add the corn syrup and vanilla extract to the mixture. Whisk until the icing is completely smooth and glossy. This is your base icing consistency.
  3. Test the consistency. For outlining and piping details, the icing should be thick enough to hold a line on the surface for about 10 seconds. If it is too thin, add more sifted confectioners’ sugar, one tablespoon at a time.
  4. If the icing is too thick for flooding (spreading smoothly over the cookie surface), add liquid (milk or water) one teaspoon at a time until it flows easily.
  5. Divide the icing into separate bowls for coloring, if desired. Add gel food coloring slowly and mix until the color is uniform.
  6. Use the icing immediately for decorating. For piping, use a piping bag fitted with a small round tip. For flooding, use a spoon or a bottle to spread the icing within the piped outline.
  7. Allow the decorated cookies to sit at room temperature until the icing is completely dry and hard. This usually takes 4 to 8 hours, depending on humidity.
  8. Store decorated cookies in an airtight container once the icing is fully set.

Notes

  • For a firmer, faster-drying icing, substitute the milk or water with an equal amount of meringue powder mixed with water according to package directions.
  • If you need to thin the icing quickly while decorating, use a few drops of water. If you need to thicken it, mix in a small amount of sifted confectioners’ sugar.
  • This recipe works well for beginner cookie decorating as it provides a reliable texture for both outlining and flooding.

Nutrition

Find it online: https://cookingbycarla.com/cookie-icing-recipe-smooth-hardens/