Here's a picture of the inside of a Carol's Cookie. The best way I can describe it is that it has a crispy/crumbly/sandy shell and dense, smooth, firm, non-chewy but not-hard center. The flavor I bought, chocolate chip, was insanely delicious; However, the flavors I sampled at Central Market (oatmeal and cinnamon) were equally amazing.
I tried to clone the cookie this morning, but made zero progress. Nothing is quite like Carol's.