"Cardamom adds just a subtle intriguing note to classic shortbread...."
INGREDIENTS
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12 oz. (1-1/2 cups) unsalted butter, softened; more for the pan(s)
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15 oz. (3-1/3 cups) unbleached all-purpose flour
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2 Tbs. cornstarch
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1-1/4 tsp. ground cardamom
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1 tsp. table salt
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5-3/8 oz. (1-1/3 cups) confectionersâ sugar
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1 Tbs. pure vanilla extract or paste