Russian Tea Cookies

1 c. butter
2 1/4 c. flour
1 tsp vanilla
1/2 c. powdered sugar
3/4 c. walnuts-chopped
1/4 tsp salt

Cream butter and powdered sugar. Add vanilla and flour, salt and mix well. Stir in walnuts (optional) . Form into roll and chill for 1 hour. Slice and bake at 375 degress for 12 min.