INGREDIENTS
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6 ounces semisweet or bittersweet (60-percent) chocolate, chopped into 1/2-inch pieces
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2 tablespoons unsalted butter, at room temperature
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1 cup flour
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2 tablespoons unsweetened cocoa powder
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1 teaspoon baking powder
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1/4 teaspoon salt
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2/3 cup sugar
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2 large eggs, at room temperature
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1 teaspoon vanilla extract
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One 4.67-ounce package chocolate mint thins, such as Andes, chopped into 1/2-inch pieces