Whoopie pies are considered a New England phenomenon and a Pennsylvania Amish tradition. They're one of Maine's best known and most loved comfort foods. Mainers will even claim that they were weaned on whoopie pies. In Maine, these treats are more like a cake than a pie or a cookie, as they are very generously sized (about hamburger size). they're so hug that you'll want to share one with a friend. A big glass of milk is almost mandatory when eating a whoopie pie.
A whoopie pie is like a sandwich, but made with two soft cookies with a fluffy white filling. Traditional whoopies pies are made with vegetable shortening, not butter. The original and most commonly made whoopie pie is chocolate, but cooks like to experiment, and today pumpkin whoopie pies are a favorite seasonal variation.