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.. 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!. Whoopie Pie. New Adventure Cooking Design Dress Up Fun Job Makeover Puzzle Exclusive. . Whoopie Pie Cooking, Kitchen. When I'm in my kitchen, I like trying a new recipe every time. My cookbook is full of delicious desserts. Besides I have all the ingredients in the fridge. I guess it takes less than half an hour to cook some delicious cookies! Freshly baked and yummy! . 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".. 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.. Bake on the middle shelf of the oven for 10 to 12 minutes. Leave to cool on the trays for a few minutes, then transfer to a wire rack to cool completely. For the buttercream frosting, melt the white chocolate in a heatproof bowl over a pan of simmering water..