In a small bowl, stir together powdered sugar and milk until smooth. Beat in corn syrup and vanilla extract until icing is smooth and glossy. If icing is too thick, add more corn syrup.
Divide into seperate bowls and add food coloring to each for desired affect. Dip cookies or paint them.
(Try different flavored extracts to taste. Mint at for holiday cookies is fun or almond.) (Tip: if the icing gets hard, microwave for a few second and stir.)
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