Classically, the official state treat consists of a shortening-based filling between spongy discs of chocolate cake. A Lewiston bakery makes an origin claim, as do the Pennsylvania Dutch, though theirs tend to be flatter and more cookie-like than our cakier, often burger-size whoops. You’ll find variations from peanut butter to oatmeal to red velvet at an annual festival in Dover-Foxcroft, and this June, the Portland Sea Dogs baseball team will briefly take the mantle of the Maine Whoopie Pies, complete with brown-and-white uniforms and a snarling whoopie pie mascot.