Does anyone know what kind of icing it is and how I can go about trying to duplicate it? I was at the mall and had a slice of a cookie cake and it was the best icing I had ever had and would like to try and make it myself but I don't know where to start. And if anyone already has the recipe figured out that would be even better, my mouth is watering just thinking about it.Thanx

This is what I found:

The icing that Great American Cookie Company uses is not homemade. They use an extra smooth vanilla and chocolate icing made by HC Brill Co.

Good luck on your quest.