Cream butter; gradually add sugar, beating until light and fluffy. Gradually ass flour, mixing well. Stir in pecans. Divide dough in half, and chill at least 1 hour.
Roll one portion of dough to ¼” thickness between wax paper. Remove top sheet of wax paper, cut cookies into rounds. Place a greased cookie sheet on top of cookies. Invert and remove waxed paper. Bake at 300º oven for 18-20 min or until lightly browned. Remove immediately to wire rack to cool. Repeat with remaining dough.