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.. 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!. Divide between the greased whoopie tins (or Yorkshire pudding tins) and bake for 10 minutes. 3. For the filling: whisk together the cream cheese and the seeds of the vanilla pod and fold in the passion fruit.. 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. Whoopie Pie Recipes Looking for whoopie pie recipes? Allrecipes has more than 20 trusted whoopie pie recipes complete with ratings, reviews and baking tips..