Shortbread cookies

Ingredients

• ½ pound unsalted butter, at room temperature
• ¾ cup sugar
• 1 egg yolk
• 1 ½ cups all-purpose flour
• ½ cup cornstarch
• ¼ to ½ teaspoon salt

1. Use an electric mixer on low speed to combine the butter and sugar, about 30 seconds. Keeping the speed on low, beat in the egg yolk, flour, cornstarch and salt, until the mixture barely holds together; don't overbeat. 2. If you want to make shapes, form the dough into a ball, wrap in plast...

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