Scoop out balls of batter using a tablespoon or small scoop. Place each ball of dough about two inches apart. Bake for 13-15 minutes until the tops of cookies spring back when touched.
In a medium bowl, add butter and mix with mixer until it looks smooth and creamy.
Spoon cream filling into an icing bag and squeeze about a tablespoon of filling onto one pumpkin cookie and then sandwich together. Continue, until all your whoopie pies are complete.