Have you ever heard of Philadelphia Butter Cake? It's sort of like St. Louis's famous gooey butter cake, but not quite the same.
I discovered this unique butter cake when I used to live in Philadelphia. Even within the city it's little known: you can mostly find it at bakeries along the northern periphery of the city. You know, the old-school types of bakeries. Usually, these bakeries sell it by the quarter sheet pan, which is a method of selling cake that I haven't seen before.
I think that this version came out pretty darned authentic. It has a great flavor: buttery, yes, but the yeast in the crust gives it a sort of "deeper" flavor. It's a perfect breakfast cake, in my opinion, eaten at the same times and in the same settings as crumb or coffee cake.