Cream together the softened butter, sugar, and vanilla until light and fluffy.

In a separate bowl, whisk together the sifted flour and salt.

Gradually add the dry ingredients to the wet ingredients, mixing until just combined.

Stir in the finely chopped nuts until evenly distributed.

Wrap the dough in plastic wrap and chill for at least 30 minutes.

Preheat oven to 400°F (200°C).

Roll the chilled dough into 1-inch balls.

Place the balls on an ungreased baking sheet, leaving some space between each.

Bake for 10-12 minutes, or until the cookies are set but not browned.

While the cookies are still warm, roll them generously in confectioners' sugar.

Let the cookies cool completely on a wire rack.

Once cooled, roll the cookies in confectioners' sugar again for a second coating.

Store in an airtight container.