Recipe shared with permission of publisher. From Kumin: These tiny sweets are a cross between cookies and candy. They are crisp, intensely chocolatey, and addictive.
In my email communication with the author, she also offered this advice after I had made the cookies:
One piece of advice - on the last few batches I made, I left the formed cookies sitting on the parchment sheets for about 30 minutes before putting the in the oven. They seemed to puff up more that way, and I baked them for only about 60-65 minutes. At 90 minutes (1&1/2 hours), they are much crunchier.