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".. whoopie pie (plural whoopie pies) A baked good consisting of two round , mound - shaped pieces of cake (typically chocolate cake ) with a sweet , creamy filling or frosting sandwiched in between.. Whoopie Pie (20) 32 minutes. 19 reviews . Here's what all the fuss about Whoopie Pies is about - and this recipe won't disappoint! What could be better than combining chocolate cake, with a creamy filling. Yummy! . In a medium bowl, Beat together the butter, 100g sugar, 1/2 teaspoon salt and 1 tablespoon vanilla. Stir in the cooked milk mixture and beat for an additional 20 minutes, until really fluffy. Sandwich filling between two discs. ENJOY!!. Place marshmallows and 1 teaspoon warm water in a microwave-safe dish and microwave on high for 20 seconds, then stir until smooth. Spread the melted marshmallows over 16 of the rounds, then sandwich them together with the remaining rounds.. Classic whoopie pie! The only thing I changed was omitting the egg whites from the filling and adding about 2 Tb. of milk and an extra 1/4 cup of powdered sugar. Great recipe! The only thing I changed was omitting the egg whites from the filling and adding about 2 Tb. of milk and an extra 1/4 cup of powdered sugar..