It is a truth universally acknowledged that all posts about madeleines must contain a reference to Proust. Because everyone (even people who have never actually read a thing by Proust) know that he had a serious thing for these little shell-shaped pastries.
High-brow literary references aside, there's a good reason that madeleines inspire such adoration. They're neither cookie nor cake, but somewhere in the middle, and utterly perfect for dunking into a mug of hot tea....