Whoopie pies transformed into a cake for a crowd, perfect for birthdays or any festive occasion. The cake can be decorated with halves of small whoopie pies, or left plain, covered with ganache. Soft layers of chocolate-espresso sponge are frosted with a light meringue buttercream.
If you just want a plain layer cake, you don't have to bake the whoopie pies and can instead distribute the entire cake mixture between the three tins.