Bakery versions of crumb cake often fall short. The crumb topping can be skimpy or dry and brittle. And the cake can suffer too, baking up too dry or not sturdy enough, so that the crumb topping simply sinks into the cake. We tackle these issues to develop the ultimate crumb cake. Recipe: New York-Style Crumb Cake, Blueberry Boy Bait Equipment: Square Cake Pans Taste test: Hot Cocoa Mix