A whoopie pie, sometimes alternatively called a gob, black-and-white, or bob is a baked good traditional to the Pennsylvania Dutch culture as well as New England, made of two small, chocolate, disk-shaped cakes with a sweet, creamy frosting sandwiched between them. In Western Pennsylvania they are known as "gobs."
They are popular both as a simple dessert or as a snack food. They can be purchased wrapped in plastic at Amish farmers' markets throughout Pennsylvania, Indiana, Virginia, West Virginia, and Ohio and are often found in restaurants and gift shops throughout Pennsylvania Dutch Country. They can also be found in most convenience stores and supermarkets throughout New England, most commonly in the states of Maine and Massachusetts, and in some convenience marts and supermarkets in New York as well as in Quincy Market located in Boston, Massachusetts. As one of the most common delicacies of the cuisine, recipes for whoopie pies are almost always included in Pennsylvania Dutch cookbooks. They can be found elsewhere throughout in the United States in various restaurants and bakeries, although uncommon.