According to Allrecipes.com, an easy recipe for a cookie glaze can be made with a cup of powdered sugar, a tablespoon of light corn syrup and two tablespoons of water. The glaze will dry to a hard shiny finish, and can be colored with food coloring if desired.
This glaze recipe yields one half cup of prepared glaze. You may also add up to ten drops of food coloring to color it, stirring them in a few drops at a time until you reach the desired color. Adding one teaspoon of vanilla gives the glaze some extra flavor, if desired.
You do not have to use the entire amount of glaze once you prepare it. However, in order to use it after it has been stored, you must stir it first so that it dries with a clear, solid color. Having a hardened glaze allows you to stack cookies for transporting them, if necessary. Wax paper is also helpful to use when glazing cookies.
The glaze works on homemade or store-bought cookies, and takes approximately 30 minutes to set up. Some suggested substitute ingredients are using milk in place of water, honey instead of corn syrup, and adding colored sprinkles.