INGREDIENTS
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4 ounces bittersweet chocolate, chopped
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3/4 cup butter, cut into pieces
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1 cup sugar
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3 large eggs
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2 teaspoons vanilla extract
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1 cup all-purpose flour
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1/3 cup cocoa powder
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1/4 teaspoon salt
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1 cup semisweet chocolate chunks
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3/4 cup walnuts, coarsely chopped (optional)
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Garnish: powdered sugar