We picked out a range of flavors, including the "grasshopper" (chocolate cake filled with fudge and topped with mint cream-cheese frosting, cake crumbs, chocolate chips and a buttercream rosette) and the "Elvis" (vanilla cake filled and frosted with banana-cream-cheese icing, with a swirl of peanut butter and peanut-butter chips).

WSJ: Testing Mail-Order Cupcakes