Preheat oven to 375F. Line a baking sheet with parchment paper.
In a large bowl, mix together with a mixer the Cake mix, 2 Eggs, Oil or Butter and Vanilla. Mix well.
Place Powdered Sugar in a small bowl.
With a 1 - 1 1/2 inch cookie scoop or with a couple of tablespoons, scoop 1 inch balls of dough and place in the Powdered Sugar and roll to coat.
Place the coated balls on the parchment lined baking sheet at least 2 inches apart.
Bake for about 8 - 11 minutes in the 375F preheated oven.
For the Icing:
In a medium bowl mix the softened Cream Cheese, softened Butter and Vanilla together until well blended.
Add in the Powdered Sugar 1 cup at a time until well incorporated and smooth. Set Aside until ready to use.
Assembly:
Using an icing bag fitted with a "star" tip or plain tip, pipe icing onto half of the cookies. Carefully top with second cookie and enjoy.
Makes 9 Whoopie Pies or 18 cookies
Note: If you do not have an icing bag, you can use a ziplock sandwich bag, cutting a small hole in one corner of bag, then gently squeeze icing onto cookies as above.
Tip: You can also roll the sides of the assembled Whoopie Pies in granulated sugar, sprinkles of your choice or colored sugar used for cake decorating.