Whoopie Pies Med Vispad Marshmallowfyllning

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1. 1
   Place racks in upper and lower thirds of oven; preheat to 350°. Line two large rimmed baking sheets with parchment paper; butter the paper.
2. 2
   Whisk 2 cups (250 g) all-purpose flour, ½ cup (42 g) Dutch-process cocoa powder1¼ tsp. baking soda, and 1 tsp. Diamond Crystal or ½ tsp. Morton kosher salt in a medium bowl to combine. Set aside and whisk 1 cup well-shaken buttermilk and 1 tsp. vanilla extract in a small bowl to combine.
3. 3
   Beat ½ cup (1 stick) unsalted butter, softened, and 1 cup (200 g; packed) brown sugar in a large bowl using an electric mixer on medium-high speed until pale and fluffy (about 3 minutes in a stand mixer with the paddle attachment or 5 minutes with a hand mixer). Add 1 large egg and beat until well mixed, scraping down sides of bowl as necessary. Reduce mixer to low speed and add half the flour mixture, mixing until just combined. Add the wet ingredients and beat until fully incorporated. Scrape down sides of the bowl, then add the remaining dry ingredients and mix until batter is smooth.
4. 4
   Spoon batter in ¼-cup mounds onto prepared baking sheets. Bake in upper and lower thirds of oven, switching position of baking sheets halfway through baking, until tops are puffed and cakes spring back when touched, 11–13 minutes. Transfer with a metal spatula to a rack to cool completely. Do ahead: Cakes can be made 3 days ahead and kept layered between sheets of parchment or wax paper in an airtight container at room temperature.
5. 5
   Beat ½ cup (1 stick) unsalted butter, softened, 1¼ cups (284 g) powdered sugar, 2 cups marshmallow cream, such as Marshmallow Fluff, and 1 tsp. vanilla extract in a medium mixing bowl with electric mixer on medium speed until smooth, about 3 minutes.
6. 6
   Spread 1 rounded Tbsp. filling on flat sides of half of cakes and top with remaining cakes. Do ahead: Filling can be made 4 hours ahead and kept covered at room temperature. Editor’s note: This whoopie pie recipe was first printed in the January 2003 issue of ‘Gourmet.’ Head this way for more of our favorite chocolate cake recipes →