INGREDIENTS
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1/2 cup all-purpose flour
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1/4 cup unsweetened cocoa powder
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4 teaspoons instant espresso
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1 teaspoon baking powder
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1/8 teaspoon salt
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4 tablespoons unsalted butter
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2/3 cup packed light-brown sugar
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1 large egg
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4 ounces bittersweet or semisweet chocolate, melted and cooled
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1 tablespoon milk
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Confectioners' sugar, for coating