Mixed-Nut Shortbread

Directions

1. 1
   Put oven rack in middle position and preheat oven to 375°F.
2. 2
   Stir together butter and 1/3 cup sugar in a medium bowl with a wooden spoon until combined well. Stir in vanilla, then add flour and mix with your hands just until a dough forms.
3. 3
   Transfer dough to a lightly greased baking sheet and spread evenly with your fingers to form an 8-inch square. Sprinkle nuts evenly over dough, pressing down to help them adhere.
4. 4
   Sprinkle remaining tablespoon sugar over nuts and bake until shortbread is deep golden, 20 to 25 minutes.
5. 5
   Cool on baking sheet on a rack, 10 minutes. Cut into 18 (roughly 3- by 1 1/2-inch) bars.