INGREDIENTS
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1/2 cup plus 2 tablespoons unsalted butter, cut into small pieces
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2 ounces unsweetened chocolate, finely chopped
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4 ounces bittersweet chocolate (70% cacao), finely chopped
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2/3 cup sugar
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1/2 cup packed dark brown sugar
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2 large eggs
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1 large egg yolk
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1 teaspoon vanilla
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1/2 cup all-purpose flour
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1/2 teaspoon salt
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1/4 teaspoon baking powder
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2/3 cup chopped walnuts, optional