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.. Learn how to prepare German Chocolate Whoopie Pies with this easy recipe. Follow along as chef Susie from Escoffier Online prepares this Valentine's Day recipe.. 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.. Bake in the oven for 8–10 minutes, or until a skewer inserted in the thickest part comes out clean. Leave the whoopie cakes to cool on the trays. Meanwhile, to make the buttercream, beat the butter, icing sugar, and cocoa powder together in a bowl until light and fluffy, then beat in the milk.. Whoopie Pie Recipe Best Whoopie Pie Filling Marshmallow Buttercream Marshmallow Cream Pie Recipes Cookie Recipes Sweet Recipes Dessert Recipes Chocolate Whoopie Pies Classic and easy, this is the best whoopie pies recipe.. 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..