"Merritt Palminteri, a guest baker on "The Martha Stewart Show," provided this recipe...."
INGREDIENTS
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2 cups all-purpose flour
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1/2 cup cocoa powder
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1/2 teaspoon salt
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1/2 teaspoon baking soda
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2 tablespoons instant espresso powder
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1 teaspoon pure vanilla extract
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3/4 cup (1 1/2 sticks) unsalted butter, softened
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1 cup packed light-brown sugar
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1/2 cup granulated sugar
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1 large egg, plus one large egg yolk
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7 ounces bittersweet or semisweet chocolate, coarsely chopped