"Active time: 1 hr Start to finish: 3 3/4 hr (includes cooling)..."
INGREDIENTS
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Ingredients for basic butter cookies
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1 1/2 sticks (3/4 cup) unsalted butter
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10 1/2 oz fine-quality bittersweet chocolate (not unsweetened), chopped
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1 1/2 cups packed light brown sugar
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3 large eggs, lightly beaten
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1 1/4 teaspoons vanilla
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3/4 cup all-purpose flour
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1/4 cup plus 2 tablespoons Dutch-process unsweetened cocoa powder
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3/4 teaspoon salt
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1 1/2 cups walnuts (6 oz; optional), toasted , cooled, and coarsely chopped