Mix together and spoon into a 12 cavity whoopie pie pan that is sprayed with non stick spray. Cook 10 min in 350 degree oven For filling 5 tbsp of cool whip 2 tbsp Marshmallow Fluff Mix together . 4.4 out of 5 stars 31 KAISER 12-Cup Whoopie Pie Baking Pan 38 x 27 cm Creativ Very Good Non-Stick Coating Short Baking Time for Sweet and Savoury Recipes by WMF. 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".. Sift together the 250g flour, bicarbonate of soda,1/4 teaspoon salt, cocoa and 200g sugar. Set aside. Set aside. In a medium bowl stir together the egg, oil, 1 teaspoon vanilla and 180ml of milk until well blended.. 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.. One thing, however, is that the 2nd listing of "1 cup milk" is unneccessary, as the directions only specify using 1 cup of milk total, and that's in the filling (it would be too runny if both cups of milk were used)..