Chocolate Whoopie Pies

 I learned how to make these when my husband requested them one year.  :)

3 cups sugar
1 cup butter, softened
4 large eggs
1/2 cup oil
1 1/2 tablespoons vanilla
6 cups flour
2 cups cocoa powder (unsweetened)
1 teaspoon salt
1 teaspoon baking powder
1 1/2 teaspoons baking soda
3 cups milk
Filling
1 cup butter, softened
1/2 cup shortening
1 1/2 cups marshmallow cream topping
3 cups powdered sugar
1 1/2 teaspoons vanilla
1/4 cup half and half
Directions
Preheat oven to 350 degrees. In a large mixing bowl, with an electric mixer, cream butter and sugar together until creamy. Add eggs, oil, and vanilla and mix until well combined. In another large bowl, sift flour, cocoa, salt, baking powder, and baking soda. Alternately add flour mixture and the milk to the egg and sugar blend, mixing well. Using a 1/4 measuring cup or large ice cream scoop (remember, you want them to be uniform), place six circles of batter on a prepared baking sheet and bake for 10 minutes. Remove from oven and allow to cool.
For the filling, combine all ingredients except for the half and half in a large mixing bowl with an electric mixer until a thick, uniform paste forms. Slowly add in the half and half until you reach a thick, creamy texture. You may add more or less half and half, depending on your taste.
Once the cakes have cooled, spread the filling between two cookie cakes. Wrap individual whoopie pies in plastic wrap for best handling and storage.