"In 'Seriously Simple' by Diane Rossen Worthington..."
INGREDIENTS
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1 cup all-purpose flour
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1 cup sugar
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1/2 teaspoon baking soda
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1/2 cup water
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1/2 cup unsalted butter, cut up
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1/2 cup unsweetened cocoa powder
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2 teaspoons instant espresso
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1/4 cup buttermilk
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1 large egg, beaten
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1 teaspoon vanilla extract
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4 tablespoons unsalted butter
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1/4 cup unsweetened cocoa powder
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1/4 cup buttermilk
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1 cup powdered sugar
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1 teaspoon vanilla extract
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1 cup chopped walnuts