""Through the years readers have told me about a dessert called a whoopie pie. Some of them say it is Midwestern in origin, others say from southwestern Pennsylvania. They have tempted me with the description—two soft little chocolate cakes between which you sandwich a creamy vanilla filling. One reader kindly called them Oreos on steroids! Well, I was curious to find the recipe and bake them. Thanks to Joan Linthicum of Raleigh, North Carolina, for sending me her recipe. These buttery, soft cakes are something Joan has been baking for more than twenty years." -Anne Byrn..."