Whoopie pie cake the promised recipe - is dedicated to all who asked him to publish. Thanks for waiting. Of all the recipe recipes, I liked this simplicity and accessibility, which does not affect . 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!. Mix together and spoon into a 12 cavity whoopie pie pan that is sprayed with non stick spray. Cook 10 min in 350 degree oven For filling 5 tbsp of cool whip 2 tbsp Marshmallow Fluff Mix together . 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.. To make the buttercream: In a medium saucepan, whisk together the 120ml of milk and 2 1/2 tablespoons flour. Cook over medium-high heat, stirring frequently, until thick. Remove from heat set aside to cool. In a medium bowl, Beat together the butter, 100g sugar, 1/2 teaspoon salt and 1 tablespoon vanilla. Stir in the cooked milk mixture and beat for an additional 20 minutes, until really . 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..