Fall in love with this easy recipe for whoopie pies. Two light discs of chocolate sponge sandwich a fluffy vanilla buttercream filling. Perfect for cake sales, packed lunch treats or making friends at the office!. A well-made whoopie pie looks like a work of art! The small, round, cake cookie with a creamy filling should practically melt in your mouth! Here are The 11 Best Whoopie Pie Recipes that left us drooling. We pretty much want to try them all!. The world's largest whoopie pie was created in South Portland, Maine, on March 26, 2011, weighing in at 1,062 pounds. Pieces of the giant whoopie pie were sold and the money was used to send Maine-made whoopie pies to soldiers serving overseas. . Heat oven to 180C/160C fan/gas 4 and line baking trays with parchment. Mix flour, cocoa, bicarb, sugar and a pinch of salt. Whisk the egg, oil and buttermilk together, then mix into dry ingredients with 75ml boiling water.. . .