L.D. 71, officially known as "An Act to Designate the Whoopie Pie as the State Dessert", read "The whoopie pie, a baked good made of two chocolate cakes with a creamy frosting between them, is the official state dessert".. Maine Whoopie Pie Festival, Dover-Foxcroft, ME. 11,092 likes · 2,124 were here. June 22, 2019 downtown Dover-Foxcroft Maine.Bakers 10 am until they run June 22, 2019 downtown Dover-Foxcroft Maine.Bakers 10 am until they run. Bake in the preheated oven for 10 to 12 minutes. Let cakes cool then make sandwiches from two cakes filled with the filling. To Make Whoopie Pie Filling: Beat egg white and mix with the milk, 1 teaspoon vanilla and 125g of the icing sugar. Mix well then beat in the butter and the remaining sugar. Beat until light and fluffy. Pumpkin. To cook the pumpkin, either bake or steam it, then peel and . A few years before the whoopie pie became Maine’s official treat, the Maine Whoopie Pie Festival was established by the Center Theatre in the small rural town of Dover-Foxcroft.. . .