Chocolate-Chocolate Whoopie Pies

• Cookies:
• 1 1/4 cups all-purpose flour
• 1/2 tsp salt
• 3/4 cup cocoa powder
• 1/2 Tbs baking soda
• 1/2 tsp baking powder
• 1 stick (1/2 cup) unsalted butter, at room temperature
• 1 cup sugar
• 1 large egg
• 1 cup buttermilk
• 1 tsp vanilla extract
• Chocolate Marshmallow Frosting
• 1 (7-ounce) jar marshmallow fluff
• 3/4 cup confectioners sugar
• 3 ounces semi-sweet chocolate, melted and cooled
• 1-2 Tbs cocoa powder
• 2 Tbs unsalted butter, softened
• 1/4 cup half and half, or as needed

1. For the cookies, preheat the oven to 400. Line 2 baking sheets with parchment paper. Whisk together the flour, baking soda, baking powder, cocoa, and salt in a medium bowl.
2. In the bowl of a stand mixer fitted with a paddle attachment, cream the butter and sugar over medium speed until light and fluffy. Add the egg, buttermilk, and vanilla, and beat until well combined. Decrease the speed to low, and slowly add the dry ingredients. Beat until just combined.
3. Using a small cookie scoop, place cookies on the baking sheets, leaving at least 1 inch between each cookie (about 12 per sheet). Bake 12 minutes, or until they spring back when lightly pressed. Remove to a rack to cool.
4. Meanwhile, make the filling. Beat the marshmallow fluff, 1/2 cup sugar, chocolate, cocoa powder, and butter until well combined. Alternately add the half and half and remaining confectioner's sugar until the desired consistency and sweetness is reached.
5. Pair the cookies off by size, and pipe filling onto 1/2 of each cookie sandwich. Press the other half down lightly, and serve.

cookies, flour, salt, cocoa powder, baking soda, baking powder, unsalted butter, sugar, egg, buttermilk, vanilla, chocolate marshmallow frosting, marshmallow fluff, confectioners sugar, semisweet chocolate, cocoa, butter

Taken from www.epicurious.com/recipes/member/views/chocolate-chocolate-whoopie-pies-50103989 (may not work)