I love whoopie pies. They are individual cake sandwiches with whatever frosting/marshmallow sugary goodness my heart desires for the filling. Since the gooey filling is on the inside, that means less mess on my hands. Most importantly, the only special equipment I need to make perfect whoopie pies are parchment sheets and a scooper for consistent portioning. This makes for professional looking cake/cookies that all cook at the same time.