"Classic Whoopie Pies have cocoa cakes with a creamy marshmallow filling. Is there anything better than a cake sandwich??..."
INGREDIENTS
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1 2/3 cups all-purpose flour
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2/3 cup unsweetened cocoa powder
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1 1/2 teaspoons baking soda
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1/2 teaspoon salt
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1 stick (8 tablespoons, 1/2 cup) unsalted butter, at room temperature
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1 cup packed dark brown sugar
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1 large egg
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1 teaspoon vanilla extract
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1 1/4 cups whole milk
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1 1/2 cups Marshmallow Fluff
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2 1/2 sticks (20 tablespoons, 1 1/4 cups) unsalted butter, at room temperature
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1 cup powdered sugar
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1 tablespoon vanilla extract