Cream together butter and sugar until light and fluffy.

Add vanilla extract and mix well to combine.

In a separate bowl, sift together flour and salt.

Gradually add the dry ingredients to the creamed mixture, mixing gently until just combined.

Stir in the finely chopped nuts.

Form the dough into 1-inch balls.

Place the dough balls on parchment paper-lined cookie sheets.

Bake in a preheated oven at 400 degrees F (200 degrees C) for 14-17 minutes, or until lightly browned.

While the cookies are still warm, roll them in powdered sugar.

Cool completely on a wire rack.

Roll the cooled cookies again in powdered sugar before serving.