In large bowl, beat softened butter, granulated sugar, powdered sugar and salt with electric mixer on medium speed about 1 minute or until fluffy. Add egg and vanilla; beat until well mixed. On low speed, gradually beat in flour 2 to 3 minutes or until blended. On very lightly floured surface, shape dough into 3 (7-inch) logs. On cookie sheet with sides, roll logs in decorating decors, pressing into dough. Wrap in plastic wrap; refrigerate at least 1 hour or overnight.