Saturday Night Live’s recent “Lazy Sunday” short film has given me an intense craving for cupcakes. The ones featured, from New York City’s Magnolia Bakery, brought to mind the following question: where can you find high-quality cupcakes in D.C.? “I don’t think this cupcake thing is at its height,” a bakery owner told New York magazine this past fall. With our northern neighbor’s Buttercup Bakery in the process of franchising nationally and Warren Brown’s outfit…