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!. The whoopie pie, a beloved American dessert, is a baked good comprised of two mound-shaped cookie-cakes with a creamy marshmallow-based filling sandwiched between them. The classic whoopie pie features chocolate cakes with vanilla flavored filling, whereas whoopie pies of modern day can be found in all sorts of flavor. The Wilton Nonstick 12-Cavity Whoopie Pie Pans should be filled with 1/8 cup (2 Tbsp) of batter per shell, and the 24-cavity mini pans take half that much batter. So you may get fewer, or more, than 36 filled pies out of this recipe Also, although they freeze beautifully, if you don't want to bake that many, you can cut the recipe in half.. Chocolate whoopie pies are an American favourite that you can now create at home with this easy to follow, delicious and simple recipe from Jamie Oliver.. 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.. Buy The Whoopie Pie Book by Claire Ptak (ISBN: 9780224086790) from Amazon's Book Store. Everyday low prices and free delivery on eligible orders..