INGREDIENTS
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1/2 cup butter - softened
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1/2 cup granulated sugar
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1/2 teaspoon vanilla extract
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1 large egg
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1/3 cup milk
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1 cup all-purpose flour
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1/4 cup cocoa powder
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3/4 teaspoon baking soda
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1/4 teaspoon salt
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Whoopie Pie Filling:
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1/4 cup butter - softened
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1/2 cup powdered sugar
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1/2 teaspoon vanilla extract
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1/2 cup marshmallow creme