In a mixing bowl, cream together butter, sugar, and extract. On low speed, mix in the flour and walnuts until just combined.
Roll into 1 inch balls and place on a cookie sheet, 1 inch apart. Bake 8 to 10 minutes until cookies just begin to brown. Remove from oven and cool. Roll in additional confectioners sugar.
Notes
NOTES and TIPS: If dough is difficult to form into a ball and is crumbly, add a little warm water one tablespoon at a time until dough is easier to handle. Other nuts, such as pecans and almonds, can be substituted for walnuts. For a chocolate option, decrease flour to 2 cups and add 1/4 cup cocoa powder to mix. Continue recipe as directed.