In medium bowl cream butter, sugar, vanilla and salt until fluffy. Stir in flour until well blended.Chill 30 minutes or until firm enough to handle. Shape into 1 inch balls.
Place 1 inch apart on ungreased cookie sheet. Bake in preheated 350 degree oven 12-15 minutes or until light brown. Remove to rack (close together) and while still warm, dust with powdered sugar. Cool.Store in airtight cool, dry place. Makes 48.