#HowItsMade Mondays 9/8c on Science This Whoopie Pie factory has a variety of delicious ingredients that give these traditional treats their signature taste.. Find great deals on eBay for whoopie pies. Shop with confidence.. The Lekue Whoopie Pie Kit includes a Decomax, a whoopie baking sheet and a recipe booklet. Whoopie pies could be considered as a cookie or as a cake and are a dessert that consists of two cake-like cookies sandwiching a creamy, frosting-like filling.. Online shopping from a great selection at Books Store.. 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.. A whoopie pie is somewhere between a cake and a biscuit. It’s made with more flour and less egg so the end result is a thin, flat and chewy sponge. It’s made with more flour and less egg so the end result is a thin, flat and chewy sponge..