Black Walnut Balls

1 cup butter, softened
2 cups sifted all-purpose flour
1/4 cup white sugar
1/2 teaspoon salt
2 teaspoons vanilla extract
2 cups chopped black walnuts
1/2 cup confectioners' sugar

Preheat oven to 325 degrees F (170 degrees C). Blend together butter, flour, white sugar, salt, and vanilla. Add black walnuts and mix well. Shape into 1 inch balls. Bake for 25 minutes on ungreased cookie sheet. Remove from oven and let cool. Roll in powdered sugar. Store flat - not stacked on top of each other.