Whoopie Pies

Oh, whoopie pies. I love them. Whoopie pies are a New Englander treat, rarely heard of in these parts. Two chocolate cake cookies filled with a marshmallow cream frosting in between. It doesn't get any better. I've already eaten 2. Alright, I ate 2, then I ate the cookie part of Abbie's after she licked out all the frosting. I'm pregnant- give me a break.
The recipe I found has you make 8 of these guys, but that would just be too big. Typically, they are about the size of your head- but I think these smaller ones are better. Don't be shy when filling them with frosting. It's supposed to ooze out.

For cakes
2 cups all-purpose flour
1/2 cup Dutch-process cocoa powder (I use Droste. It's the best.)
1 1/4 tsp. baking soda
1 tsp. salt
1 cup well-shaken buttermilk
1 teaspoon vanilla
1 stick (1/2 cup) unsalted butter, softened
1 cup packed brown sugar
1 large egg
For filling
1 stick (1/2 cup) unsalted butter, softened
1 1/4 cups confectioners sugar
2 cups marshmallow cream such as Marshmallow Fluff (use what you can find- we can't get Fluff out here.)
1 tsp. vanilla

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 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 ending with flour, scraping down side of bowl occasionally, and mixing until smooth.
Using a tablespoon size ice cream scoop, scoop the batter onto silpat or parchment lined baking sheets. Bake in upper and lower thirds of oven, switching position of sheets halfway through baking, until tops are puffed and cakes spring back when touched, about 8 minutes. Transfer with a metal spatula to a rack to cool completely.
Make filling:
Beat together butter, confectioners sugar, marshmallow, and vanilla in a bowl with electric mixer at medium speed until smooth, about 3 minutes.
Assemble pies:
Spread the filling on flat side of half of cakes and top with remaining cakes.
Makes 24 whoopie pies