Preheat oven to 375. Spray whoopie pan.
In mixing bowl, mix the eggs, sour cream, sugar and pumpkin together.
In a separate bowl whisk together flour, baking powder, salt, ginger, cinnamon and nutmeg.
Slowly add to mixing bowl on medium till all incorporated.
Pour into whoopie pan about 2/3rds of the way full (or according to the directions of your whoopie pie pan) and bake for 12-15 minutes or until done.
When done pull out of oven and cool for about 2 minutes before removing from pan.
FOR THE ICING:
Prepare filling by mixing butter, cream cheese, sugar, and vanilla together. Stir in chocolate chips.
Spoon the icing between two pies and ENJOY!