You can use any cookies that you have on hand, homemade or otherwise. I used Cherrybrook Kitchen's Mini Vanilla Grahams. I put a teaspoon of the frosting on the flat side of a cookie and then pressed another cookie on top to form a sandwich. And served the sandwiches with a cold glass of milk.
I am looking forward to trying it with other wheat-free cookies recipes, like maybe a chocolate one! YUM!