Whoopie Pies

1. Preheat oven to 350 degrees F, or preheat a convection oven to 315 degrees F.
2. In a large bowl of an electric mixer, beat the sugar, butter, and eggs together until well combined. Add the oil and vanilla and beat again.
3. In a separate bowl, combine all of the dry ingredients. Add half of the dry mixture to the egg mixture and beat or stir to blend. Add 1 1/2 cups milk and beat again. Add the remaining dry mixture and beat until incorporated. Add the remaining 1 1/2 cups milk and beat until blended.
4. With a large spoon, scoop out 32 circles of batter onto a baking sheet. Bake for 10 to 12 minutes. Let cool.
5. Spread filling onto 16 circles and place remaining circles on top, to make 16 Whoopie Pies.

Filling:

1. 1 1/2 cups shortening
2. 3 cups confectioners' sugar
3. 1 1/3 cups marshmallow topping
4. Dash salt
5. 1 teaspoon vanilla extract
6. 1/3 to 1/2 cup milk
7. In the bowl of an electric mixer, combine all ingredients except the milk and beat well. Add just enough milk to achieve a creamy consistency. Spread filling across cooled cookie circles.