"Best Christmas treat I tried in 2009, and it's been on my holiday cookie tray every year since......"
INGREDIENTS
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2 cups all purpose flour 1/4 teaspoon salt 1 cup (2 sticks) unsalted butter, at room temperature 1 cup granulated sugar 1 teaspoon vanilla extract 1 large egg yolk 6 ounces bittersweet or semisweet chocolate, chopped (or use chocolate chips) 1 cup ch