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This Christmas Cookie icon recipe that hardens will help you take your holiday cookie game to the next level. It is great for making intricate designs on your Christmas cookies, gingerbread houses, or any holiday cookies. Plus it doesn’t use any raw egg whites. Just a few simple ingredients to make the best sugar cookie icing ever!

Since you are here and love this icing that hardens recipe, make sure to checkout these foolproof cutout sugar cookies that don’t spread, these Christmas marbled sugar cookies, these gingerbread man cookies, as well as this Christmas fudge.

Christmas sugar cookie icing that hardens
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When it comes to sugar cookies and decorating them you need to make sure that your icing has that perfect consistency. Something that can be used for outlines, flooding, and even decorating once the first layers sets and that’s why I am sharing my super easy and oh so perfect icing recipe.

It uses a fee staple ingredients that you probably already have at home

This is the best sugar cookies icing recipe that hardens!

Since we all love a good glossy sugar cookie icing, I played around with ratios and ingredients and I think this will be the best way to go. A little powdered sugar, some vanilla, milk, and corn syrup to give it that beautiful sheen. So if you are a first time cookie decorator, this recipe is going to come in so handy, allowing you to have some fun with your family and create new cookie decorating traditions.

Why you need to make this recipe!

  • It uses basic ingredients that you might already have at home.
  • This recipe comes together extremely fast. The only thing is that you have to be patient when waiting for it to harden.
  • It creates an icing that has the perfect glossy surface when it sets.
  • You can use it to decorate your Christmas cookies, as well as any other holiday or celebration cutout sugar cookies.
Ingredients on the counter

Ingredients for the best icing recipe ever!

Here are the ingredients you will need to make this easy shiny icing for cookies.. Make sure to scroll down to the recipe card for the full detailed ingredient measurements. 

  • Icing sugar– This is also called confectioner’s sugar or powdered sugar.
  • Corn syrup- the corn syrup is used in this recipe to produce an icing that have
  • Clear vanilla extract– You can use pure vanilla extract if you want but just be aware that your icing will not be so white.
  • Milk or water– Start with a tiny bit and mix. The less water you use the thicker the icing is. Of course it will depend on what you are doing with it. For example flooding will need to be a bit thinner while the more intricate designs like writing on your cookie (or outline icing) would have to be a bit more thick.
  • Gel food coloring– I prefer to use gel food coloring to make sure not to add too much unnecessary liquid to my icing. But if you don’t have that check the FAQ for tips.

This is how you can make this homemade icing. Make sure to scroll down to the recipe card for the full detailed instructions! 

  1. Add the powdered sugar, vanilla extract, milk, and corn syrup to a large bowl.
  2. Whisk to combine and assess if you need to add more or less liquid to get you ricing to the desired consistency.
  3. If you want to color you ricing, separate into small bowls and color each one to your liking.
  4. Use to dip your cookies, add it to squeeze bottles and use it that way, or pour it into a piping bag with a thin piping tip and decorate your cookies.
Icing in a bowl

Frequently asked questions – FAQ

Proper storage of the leftover icing is a must to be able to reuse it later. Make sure to store it in a squeeze bottle with a cap or an airtight container in the fridge for up to 3 days. Allow it to get back to room temperature before using it again.

Can I use regular vanilla extract instead of the clear vanilla extract?

You sure can but just be aware that the color of your icing will not be as white. I do that when I am planning on coloring my icing with either gel food coloring. For example my dark green Christmas trees icing has regular vanilla extract because I was going to color it with a dark enough color that you won’t be able to tel that it was slightly less white to start with.

Colored icing in piping bags

Can I use liquid food coloring?

You can but make sure that you add a little less milk or water to account for the extra moisture that the food coloring will bring. Because if you do not your icing will be too runny.

My icing is too thin, what should I do?

If you notice that your icing is too thin you can always add a little more powdered sugar to counteract the liquid in the recipe.

The possibilities are truly endless, as long as you chose a clear extract if you want to keep your extra white colored icing. Here are some other flavor ideas:

  • Coconut extract
  • 1/4 tsp almond extract or even less because it is so strong.
  • lemon extract

How long does the drying process take for the icing?

This will depend on how thin or thick you make your icing. But it will range between a few hours to a whole 24 hours. To be safe, make a trial cookie and see how long it takes for that on to set and assess how long it will take for the others ones. Make sure not to poke your finger on there to not mess up the surface of the icing.

How long can I store iced sugar cookies?

Once the icing on top of your cookies has set and has hardened you can store your cookies in an airtight container at room temperature for up to 2 weeks. Make sure to separate layers of cookies with parchment paper or wax paper to really be on the safe side and avoid any messes. I know you worked so hard on your cookies so taking this extra step will avoid you having any bad surprises.

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4.97 from 26 votes

Sugar cookie icing that hardens

Having a good from-scratch icing recipe that hardens is a must during the holidays and that's why this is the only recipe you'll ever need from now on! It hardens perfectly, and makes frosting sugar cookies so fun!
Prep: 5 minutes
Total: 5 minutes
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Ingredients 
 

Instructions 

  • Sift the powdered sugar in a medium/large bowl. Add in the corn syrup, vanilla extract, and milk or water. Stir vigorously until smooth.
    2 cup powdered sugar, 1 & 1/2 tbsp corn syrup, 1/2 tsp vanilla extract, 1 & 1/2 tbsp milk or water
  • Add more milk is needed to get to your desired consistency. You want the icing to slowly fall off the spoon, leaving a pretty thick layer behind it.
  • Divide the icing into multiple smaller bowls if making multiple different colored batches. Use to decorate cookies, let the icing set at room temperature before storing the cookies in an air tight container.
    gel food coloring

Nutrition information is automatically calculated, so should only be used as an approximation.

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If you enjoyed this icing recipe that hardens make sure to pin it for later!

About Chahinez

Chahinez Tabet Aoul is the recipe developer, photographer, and writer behind Lifestyle of a Foodie and Simple Copycat Recipes. Based in Las Vegas, Nevada, Chahinez is known for creating approachable, high-reward recipes that feel like they came straight from your favorite restaurant. Only easier, more fun, and made right a thome!

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4.97 from 26 votes (22 ratings without comment)

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34 Comments

  1. Sharon says:

    Can you tell me how many cookies this will cover?

    1. Chahinez says:

      that’s a little difficult because that depends on the size of your cookies. Sugar cookies could be small, medium, large, or cut into intricate shapes. I don’t want to give you a wrong answer.

  2. Kerina Murray says:

    5 stars
    Hi there, is there a corn syrup substitute for those in the UK?

    1. Chahinez says:

      From my research, I’ve found that people in the UK use something called Golden Syrup or Glucose Syrup.

  3. Marie Elizabeth Diane Holden says:

    Can you substitute the Vanilla Extract for a different flavor, say something like Peppermint?

    1. Chahinez says:

      Absolutely!

      1. Bethany says:

        can I add cocoa powder?

      2. Chahinez says:

        Yes you can, up to 3 tablespoons. Just know that you might have to add a tablespoon more of milk just to even out the texture.

  4. Joanna says:

    I normally use a buttercream frosting on my sugar cookies, but I wanted a frosting that would mail easier to my grandkids. Most importantly, does your icing taste good? ๐Ÿ˜Š

    1. Chahinez says:

      Thatโ€™s so sweet that youโ€™re mailing cookies to your grandkids! โค๏ธ This icing is perfect for that because it hardens beautifully, making it great for shipping. For the best flavor, I recommend using high-quality vanilla and powdered sugar without cornstarch. Trader Joeโ€™s powdered sugar with tapioca starch is a great option! Hope they love the cookies! ๐Ÿ˜Š

  5. BECKY SMITH says:

    I made our traditional sugar cookies tonight and with this frosting recipe they turned out so much better! I love this recipe and the sheen of the hardened frosting on my sugar cookies. This had to be the easiest frosting recipe Iโ€™ve used and had a great taste too! Thank you for sharing. I will save it and use it again!

    1. Chahinez says:

      Thank you so much!