Whoopie Pies

*2 cups flour

*2/3 cup cocoa powder

*1 1/4 teaspoons baking soda

*1 teaspoon salt

*1cup shaken buttermilk

*1 teaspoon vanilla(liquid)

*1 stick (1/2 cup) unsalted butter ,softened

*1 cup packed dark brown sugar

*1 large egg

For filling

*1 stick(1/2 cup) unsalted butter ,softened

* 1 1/4 confectioner’s sugar

*2 cups marshmallow cream such as Mashmallow fluff

*1 teaspoon vanilla

Preparation

Make cakes :

Preheat oven to 350 °F

Whisk together flour,cocoa,baking soda,and salt in a bowl until combined. Stir
together buttermilk and vanilla in a small bowl.

Beat together butter and brown sugar in a large bowl with an electric mixer at
medium -high speed until pale and fluffy ,about 3 minutes in a s standing mixer
or 5 minutes with a handheld,then add egg,beating until combined well.Reduce
speed to low and alternately mix in flour mixture and buttermilk in
batches,beginning and anding with flour,scraping down side of bowl occasionally
, and mixing until smooth.

Spoon tablespoon size of batter onto parchment lined baking sheets.Bake for
8-10 minutes.

Make filling:

Beat together butter, confectioners sugar,mashmallow,and vanilla in a bowl with
electric mixer at medium speed until smooth,about 3 minutes.