Whoopie Pie Cake Recipe 2 cups of Marshmallow FLUFF (or you can melt some marshmallow along with a little bit of milk) 1 1/2 tsp of vanilla extract Cream the butter and the powdered sugar . 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.. L.D. 71, officially known as "An Act to Designate the Whoopie Pie as the State Dessert", read "The whoopie pie, a baked good made of two chocolate cakes with a creamy frosting between them, is the official state dessert".. Looking for whoopie pie recipes? Allrecipes has more than 20 trusted whoopie pie recipes complete with ratings, reviews and baking tips.. But it’s not just bigger that makes this whoopie pie cake better. Let’s go to the next page (click the Next button below) to find out what makes the whoopie pie cake even better… Let’s go to the next page (click the Next button below) to find out what makes the whoopie pie cake even better…. The whoopie pie (alternatively called a black moon, gob [term indigenous to the Pittsburgh region], black-and-white, bob, or "BFO" for Big Fat Oreo [also recorded as "Devil Dogs" and "Twins" in 1835 ]) is a US baked product that may be considered either a cookie, pie or cake..