The recipe for the bar is found here at the Food Network site:
50 Bar Cookies : Food Network | Easy Baking Tips and Recipes: Cookies, Breads & Pastries : Food Network | Food Network
Look for the Birthday Cake bars, which will direct you to make the Sugar Cookie bars. I made the vanilla frosting by combining 1 1/2 tablespoons of soft butter, 1 1/2 cups of powdered sugar, 1 teaspoon vanilla and just enough milk to get it to the frosting consistency, about 1-2 tablespoons. Of course he wanted blue frosting, so I added blue food coloring.