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6 ounces unsweetened chocolate, coarsely chopped
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12 tablespoons (1 1/2 sticks) unsalted butter
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2 cups sugar
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4 large eggs, at room temperature
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4 teaspoons pure vanilla extract
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1/2 teaspoon salt
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1 1/2 cups all-purpose flour
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1 cup semi-sweet chocolate chips
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1 cup chopped walnuts, optional
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