2 1/4 sticks (1 cup plus 2 tablespoons) cold unsalted butter
3 cups all-purpose flour
3/4 cup confectioners' sugar
1/2 teaspoon salt
3 large egg yolks
3 tablespoons ice water
1 teaspoon vanilla
Cut butter into bits. In a food processor pulse flour, confectioners' sugar, and salt until combined well and add butter, pulsing until mixture resembles coarse meal.
In a small bowl whisk together yolks, ice water, and vanilla until combined well and add to flour mixture, pulsing until incorporated.
Form dough into a ball and divide into 2 pieces.
Form each piece into a ball and flatten to form disks. Chill disks, wrapped separately in plastic wrap, at least 1 hour and up to 3 days.
Use as needed in making tartlets.