A Whoopie pie is a Pennsylvania Dutch treat seen all over the Midwest and Northeast United States. It's usually two soft, cakey chocolate cookies with a creamy sandwich filling of marshmallow and vanilla. They are utterly delicious. Here's a fall twist: spicy pumpkin Whoopie pies! The picture above is from Dean & Deluca, where they will charge you $55 for 12 Pumpkin Whoopie Pies. You can make them yourself, though, with this recipe from King Arthur Flour.