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- Directions
Preheat oven to 350º F and line 2 baking sheets with parchment paper or non-stick spray.
In a bowl, combine the flour, cocoa powder, baking soda and salt.
In a large bowl, cream together the butter and sugar. Once mixture is light and fluffy, add the egg and vanilla.
Alternate between adding dry ingredients and buttermilk to the egg mixture, beginning and ending with the dry ingredients. Add in 1/3 cup increments. Scrape down the sides and make sure everything is incorporated.
Using an ice cream scoop or tablespoon, spoon equal amount of batter (1/4 cup) 2-3 inches apart on the baking sheets.
Place in oven and bake for 12-15 minutes. Tops should be puffed up and springy, and toothpick inserted in center should come out clean.
Transfer to a wire rack to cool.
In a mixer or using a hand mixer, beat shortening and marshmallow fluff together.
Slowly add in powdered sugar and vanilla extract.
Once whoopee pies are completely cool, spoon filling (1-2 tablespoons) onto flat side of cake and top with second cake to create a little sandwich. Optional: sprinkle top with powdered sugar.
Serve immediately or wrap individually in plastic wrap to preserve freshness.
