With an electric mixer or by hand, cream butter and sugar in a large bowl. Add vanilla and then stir in flour and chopped nuts until combined. Roll tablespoon-sized pieces of dough into crescent shapes. Repeat until no dough remains. Arrange on an ungreased baking sheet and bake for 20 to 30 minutes, until cookies are lightly golden.
While cookies are in the oven, put 2 cups powdered sugar in a large resealable bag. Remove cookies from baking sheet and add them to the bag of powdered sugar. Carefully turn cookies in sugar while they are still hot. Remove cookies from bag and shake lightly to remove excess sugar.
A viewer or guest of the show, who may not be a professional cook, provided this recipe. It has not been tested for home use.