This quick and easy cookie icing is perfect for sugar, gingerbread, oatmeal, shortbread, and your favorite cutout cookies. This shiny homemade recipe will get hard as it dries and has a beautiful glossy appearance.
Sift (or using a fork to fluff and separate) powdered sugar into a small mixing bowl.
Add 3 teaspoon of milk, 2 teaspoon of corn syrup, and vanilla extract. Stir vigorously with a fork until icing starts to come together. Using a rubber spatula to scrape down the edges. Continue to stir with a fork until it is smooth and ready to go.
If needed, add additional milk to thin icing more. It will be the correct consistency if it slowly drips from a spoon or fork as you tip it.
OPTIONAL - For colored icing, divide a bit of icing into small bowls and add drops of gel food coloring and mix thoroughly to combine. Add additional coloring for deeper/darker colors as desired.
The icing will thicken and start to harden if not worked with. You can mix vigorously to have it come back to life so it is easier to drip, dip, spread, or pipe onto cookies.