In a medium bowl, combine powdered sugar, salt water, and vanilla extract. Stir until smooth. Stir in corn syrup. Check consistency: If too thick, add a few drops of water at a time until spreadable. If too thin, add more powdered sugar until it thickens. Add food coloring, if desired, and mix well.
To decorate, spread a thin layer of icing over cooled cookies with a butter knife or offset spatula. You can also dip the tops of cookies directly into the glaze, a little messy, but faster!Place cookies on a wire rack or parchment paper. Let sit uncovered at room temperature until glaze is dry. (Drying time varies, overnight in humid climates or just a few hours in dry climates.) Makes 1 ½ cup of icing or enough for about 35-40 cookies (2.5-3 inches each).
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Notes
This glaze also works beautifully on brownies, bundt cakes, and quick breads. For bolder colors, use gel food coloring so you don’t thin out the glaze. We used Williams Sonoma food coloring in this recipe.