I made these with a chocolate crust. I crushed 1 cup of chocolate Teddy grahams and 1 cup of the chocolate cookies you use for icebox cake (I think they are called Famous Chocolate Wafers). I also eliminated the sugar from the crust, and I used a 9 x 13 pan, which makes the crust a little thinner than the 9 x 9. These bars are even better after having been refrigerated for a couple of days.