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!. Whoopie Pie Cafe, Bangor: See 20 unbiased reviews of Whoopie Pie Cafe, rated 4.5 of 5 on TripAdvisor and ranked #53 of 158 restaurants in Bangor.. Make the whoopie pies: Place the flour, cocoa powder, baking soda and salt in a bowl and whisk together. In a separate bowl, combine the butter and brown sugar and beat with an electric mixer until pale and fluffy. Add the vanilla extract and egg and beat until combined. Add the flour mixture in 2 additions, alternating with the buttermilk.. 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".. 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..