Peanut Butter Sandwich Cookies, aka "The Nora Ephron" by Tom Douglas and Shelley Lance "The Dahlia Bakery Cookbook". (the most famous recipe in the book. Named after the novelist that was crazy about these cookies from Dahlia Bakery)
Hazelnut butter gives the cookies a deep, rich flavor. Look for it in natural foods stores. Before measuring the hazelnut butter, stir gently with a fork to mix in any oil that has separated from the butter.