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.. This is a classic whoopie pie recipe, but with a marshmallow creme filling. Those who like rocky road will love these. Marshmallow creme is a spreadable marshmallow confection, which can be purchased online or in specialty shops.. 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.. 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".. We come from an area of Pennsylvania where we can buy homemade whoopie pies, but this place is the best. There are so many kinds of whoopie pies you just can't imagine. And they are just great!!! How about a whoopie pie that is 8 inches round? Totally awesome. This is a shop that sells whoopie pies and muffins in. 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..