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! . Beat the butter and sugar in an electric mixer on high speed until light and fluffy. Beat in the egg, followed by the vanilla and buttermilk. Reduce speed to low, add dry ingredients and beat until combined.. 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.. A whoopie pie is a sweet baked item which is a cross between a soft biscuit, a cake and a pie. It is made up of two round pieces of cake-like biscuits (cookies) which are sandwiched together with a sweet, creamy filling. Other names given to these sweet delights have included hucklebucks, gobs and BFOs (big fat Oreos).. Ever heard of a whoopie pie? They're a bit like a macaroon but with a more cake-like texture. Hugely popular Stateside, the name comes from when Amish women would put them in farmers' lunchboxes and they'd supposedly shout 'whoopie' if they found one in their box!. 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..