Whoopie Pie Recipes Looking for whoopie pie recipes? Allrecipes has more than 20 trusted whoopie pie recipes complete with ratings, reviews and baking tips.. 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.. I just tweaked the proportions a bit to make it able to stand on it’s own, and I think you’ll love this whoopie pie version. But it’s the filling that really takes these whoopie pies to the next level.. 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.. . .