Whoopie pies are a popular dessert that consists of two soft, cake-like cookies sandwiching a creamy filling. Traditionally, the cookies are made from chocolate or vanilla cake batter, while the filling is often a sweet mixture of marshmallow fluff and buttercream. These treats are believed to have originated in the Northeastern United States, particularly in Maine and Pennsylvania. They are enjoyed at various events and can be found in bakeries, fairs, and even homemade versions. Whoopie pies come in various flavors, making them a versatile and beloved dessert choice.