Of course, scores of recipes for the classic treat are readily available to fulfill one's whoopie pie-related curiosities, theoretically complicating the selection process. However, settling upon what seemed like a suitable guideline was not that difficult at all. I consulted two separate recipes for the cake and filling, respectively, although they were quite similar and I'm sure each in its entirety would have sufficed as a complete pie-assembly guideline. Perhaps I should have kept to a single source for both cake and filling. Although the final pies were delightful handfuls of sweet deliciousness, I felt a bit unsatisfied with the texture of their components; the cake was soft but a bit flat, while the filling seemed more runny than fluffy. So despite the pleasant flavor outcome--chocolate and vanilla are usually a winning combination--the pies didn't strike me as particularly extraordinary. Maybe subsequent attempts at perfecting them will change my mind.