"We prefer Droste brand Dutch-process cocoa for this recipe because it gives the cakes a richer chocolate flavor. Though whoopie pies can be served on the same day they're made, we think the cakes are much better a day after baking...."
INGREDIENTS
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2 cups all-purpose flour
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1/2 cup Dutch-process cocoa powder
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1 1/4 teaspoons baking soda
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1 teaspoon salt
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1 cup well-shaken buttermilk
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1 teaspoon vanilla
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1 stick (1/2 cup) unsalted butter, softened
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1 cup packed brown sugar
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1 large egg
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1 stick (1/2 cup) unsalted butter, softened
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1 1/4 cups confectioners sugar
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2 cups marshmallow cream such as Marshmallow Fluff
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1 teaspoon vanilla