In a medium bowl, combine powdered sugar, 2 tablespoons milk, light corn syrup and vanilla extract. Stir with a spoon until well combined. Note: Set aside 1 tablespoon milk.
If frosting is too thick, add ¼ teaspoon milk at a time until consistency is spreadable but thick and pipeable.
Divide sugar cookie frosting if using gel coloring. Add a drop of gel coloring to frosting.
Prepare piping bag with tip and transfer frosting.
Pipe frosting on cookie and spread it using a tooth pick or barbecue stick. Allow it to dry for at least 2 hours or more to fully dry. Note: This will depend on frosting consistency and how much frosting was applied to cookies.
Store in sealed container at room temperature.
Notes
The CALORIE CALCULATION is only for frosting.
I used UNSWEETENED ALMOND MILK.
You can make sugar cookies a day or a few days in advance and store in a sealed container.
Frosting should be thick but pipeable. If you added too much milk, thicken it with powdered sugar.
Use clear vanilla if you like a very white frosting or add white gel coloring.
I used Wilton #2 and #4 round tip.
If using zip lock bag, cut a very tiny hole at the tip of bag.
You can also spread frosting with a knife instead of piping bag or zip lock bag.
Sugar cookies are stackable as long as frosting has fully dried out.