1. Mix butter and powdered sugar in a large bowl until smooth and creamy.2. Add vanilla. Mix well.3. Add flour and walnuts. Mix well.4. Roll into small balls and flatten on a greased baking sheet.5. Bake in a preheated 35-degree oven for 12 to 15 minutes.6. When cookies are cool, sprinkle powdered sugar on top.Makes about 5 dozen.