INGREDIENTS
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1 cup unsalted butter, at room temperature
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1 cup powdered sugar
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1 egg
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1 teaspoon vanilla extract
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1 1/2 cups all-purpose flour
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2/3 cup cocoa powder
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1/4 teaspoon salt
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12 ounces semisweet chocolate
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1/4 cup unsalted butter
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3/4 teaspoon peppermint flavor