INGREDIENTS
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1 1/2 cups all purpose flour
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3/4 cup unsweetened cocoa powder (preferably Dutch-process)
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1/4 teaspoon salt
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3/4 cup (1 1/2 sticks) unsalted butter, room temperature
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3/4 teaspoon peppermint extract
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1/2 teaspoon vanilla extract
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1 cup sugar
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1 large egg
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6 ounces bittersweet (not unsweetened) or semisweet chocolate, chopped