Pumpkin Whoopie Pies (Gluten Free & Vegan)

Are they little cakes?  Are they big cookies?  Who cares?*  These little treats aim to please and trust me, they do.  The original recipe comes from Penzey's, who recommend marshmallow creme in the filling to make it fluffy.  I can't find a gluten free, dairy free, soy free equilavent so I left that particular ingredient out.  I was just overwhelmingly pleased to be finally able to use a cream