INGREDIENTS
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Nonstick vegetable oil spray
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10 tablespoons (1 1/4 sticks) unsalted butter, cut into 1-inch pieces
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1 1/4 cups sugar
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1/4 teaspoon salt
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2 teaspoons water
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3/4 cup natural unsweetened cocoa powder (spooned into cup to measure, then leveled)
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1 teaspoon vanilla extract
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2 large eggs, chilled
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1/3 cup plus 1 tablespoon unbleached all purpose flour
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1 cup walnut pieces