"You can make a lot of these in one batch. Be sure to let the chocolate set before you cut the cookies...."
INGREDIENTS
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8 oz. (16 Tbs.) unsalted butter, at room temperature
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8 oz. (1 cup firmly packed) dark brown sugar
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1 large egg yolk
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1 tsp. vanilla extract
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1/4 tsp. salt
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9 oz. (2 cups) all-purpose flour
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10 oz. bittersweet chocolate, chopped
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1/4 cup milk
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3-1/2 oz. (1 cup) chopped hazelnuts, toasted