"These Mocha Whoopie pies have a subtle coffee flavor that intensifies the chocolate!..."
INGREDIENTS
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1 cup sugar
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¼ teaspoon salt
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½ cup butter, softened
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1 teaspoon vanilla
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1 egg
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2 cups all purpose flour
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1 teaspoon baking soda
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½ cup cocoa
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½ cup hot strongly brewed coffee
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½ cup buttermilk
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¾ cup butter, softened
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2½ cups powdered sugar
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2 tablespoons cocoa powder
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2 tablespoons hot strongly brewed coffee