INGREDIENTS
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1 1/4 cup unsalted butter (2 1/2 sticks)
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2 1/4 cups sugar
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1 1/2 cup unsweetened cocoa powder (natural or Dutch process)
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2 teaspoons vanilla extract
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3/4 teaspoons salt
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1 tablespoon water
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4 eggs, chilled
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2/3 cups all-purpose flour
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1 3/4 cup walnuts, chopped finely
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1 cup chocolate chips (bittersweet or semisweet)