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!. 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.. KAISER 12-Cup Whoopie Pie Baking Pan 38 x 27 cm Creativ Very Good Non-Stick Coating Short Baking Time for Sweet and Savoury Recipes. Whoopie pie; Share on Facebook Twitter Google + Whoopie pie. Share on Stretch on the baking sheet and cover it letting it rest for 30 minutes in the fridge. Cut in the desired shape, preferably round and bake in the oven previously preheated at 180º C between 8 and 10 minutes. Remove and let it cool down. For the filling: With an electrical mixer, mix the butter, slowly adding the sugars . 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.. 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..