Gwendolyn and I made Purple Whoopie Pies with Marshmallow Filling. Gwendolyn mixed all of the ingredients together for the cakes. While the cakes were in the oven, Gwendolyn mixed the butter, cream cheese, fluff, vanilla and sugar until it was creamed together. Next, we placed the filling into the refrigerator until it was set. Using a small ice cream scoop we dolloped the filling between two cakes to make the Whoopie Pies.