Testing Egg-Free Hard-Drying Cookie Icing

A friend posted a recipe link to an "easy," hard-drying icing similar to this over the holidays, and I was intrigued. Would cookie icing made without egg whites or meringue powder really dry hard? Could it be as useful as royal icing, and this easy to make? I had to try it myself to see. But I was skeptical, so it took me a few months.

What You Need:
2 cups powdered sugar
3-4 Tbsp. milk (or water)
1 Tbsp. light corn syrup
2 tsp. clear vanilla flavoring
Optional:
Food coloring 
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