There is a treasure trove of a bookstore in new york city called bonnie slot-nick cookbooks. It is a local bookshop filtered through a West Village lens: small, quaint, very knowledgeable staff of one, odd hours, well stocked. Better yet, it trades largely in vintage cookbooks. Luckily, Bonnie lets customers browse (though I always buy more than I need), and it was during such a session that I made an important discovery. Malt powder, one of my favorite ingredients, was a star in vintage cookbooks and was widely featured in the Pillsbury Bake-Off contenders for years. Malt powder was everywhere, and then it nearly disappeared. I am glad that a malt resurgence has recently taken hold, and I am equally pleased with this spin on the classic Oreo. If you are feeling exceedingly motivated, I suggest you make the Salt-n-Pepper Cookies at the same time you make these. They both contain the same filling (so you can just double it).