Hi, I made these cookies yesterday with this recipie. Used more milk to get consistency (too much in the case of the green icing), and they hardened in a few hours. I colored using Wilton colors, not liquid food coloring. I put the icing in ziplock bags, cut and end off and pipe onto cookie. I made 2.5 x the recipie and iced 2 dozen cookies. HTH
recipe link:
http://allrecipes.com/recipe/sugar-cookie-icing/
Ingredients
1 cup confectioners' sugar
2 teaspoons milk
2 teaspoons light corn syrup
1/4 teaspoon almond extract
assorted food coloring
Directions
1. In a small bowl, stir together confectioners' sugar and milk until smooth. Beat in corn syrup and almond extract until icing is smooth and glossy. If icing is too thick, add more corn syrup.
2. Divide into separate bowls, and add food colorings to each to desired intensity. Dip cookies, or paint them with a brush.