I made them with caramel extract.
Vanilla has gotten so expensive over the last year or two so I've been experimenting with other flavorings. Caramel is good (it works really well with most nut/seed butters), but I haven't been able to find it recently in a natural version, only imitation. There are plenty of pure extracts at the grocery store, though. I want to try those cookies next with dried apricots, and probably some orange extract/zest. They might even be good with rosemary.
Oh, FYI, the Ocean Spray low-sugar cranberries she linked to in the recipe are sweetened with sucralose (Splenda).