Eightyrecipes
Sugar Cookie Icing that Hardens
Sweet, glossy, and perfectly firm, this sugar cookie icing hardens to a beautiful, stackable finish. With just powdered sugar, corn syrup, milk, and vanilla, you’ll get the classic Christmas-cookie bakery sheen—no messy fingers and no soft, sticky cookies. Customizable for color or consistency, it’s the icing your holiday cookies deserve.
Ingredients
Sugar Cookie Icing
- 2 cups confectioners' sugar sifted; also called powdered sugar
- 2 tbsp light corn syrup
- 2-3 tbsp milk or water plus more as needed for consistency
- 1 tsp vanilla extract
- gel food coloring as desired, for color
Instructions
- Sift the confectioners' sugar into a bowl to avoid lumps and ensure a smooth icing.
- Add the corn syrup, vanilla extract, and 2 tablespoons of milk or water to the bowl. Stir vigorously with a whisk or spoon until the icing is smooth and glossy.
- Check the consistency: You want it thick but drizzly—if needed, add more milk or water, a few drops at a time, until you can drizzle the icing in ribbons that sit briefly on the surface before sinking in.
- If coloring, divide icing into separate bowls and tint each portion with a small amount of gel food coloring. Stir well and adjust until you reach your desired shade.
- Decorate completely cooled sugar cookies by spreading or piping the icing as you like. Add sprinkles or sanding sugar while icing is wet if desired.
- Let the decorated cookies set at room temperature until dry and firm, about 6-8 hours or overnight, before stacking or storing.
Notes
Storage: Store leftover icing in an airtight container in the fridge for up to 1 week. Press plastic wrap directly onto the icing's surface to prevent a sugar crust. Stir and add a splash of milk/water to loosen before using again.
Freezing: Transfer icing to freezer-safe bags or containers, removing air. Thaw in the fridge and stir well before using. Decorated cookies can be frozen once the icing is fully set.
Variations: Try adding a dash of lemon juice instead of vanilla for a citrus twist, or a little almond extract for a nutty flavor. Plant milk works great. Swap light honey or glucose syrup if you’re out of corn syrup—but note the set may vary slightly.
Nutrition
Nutrition is an estimate, calculated automatically.
Tried this recipe?Tag @eightyrecipes on Instagram and Pinterest, we love to see it. ★ Leave a rating