1. Heat oven to 350° F.
2. Beat butter and shortening in large bowl until well blended. Add brown sugar and granulated sugar; beat thoroughly. Add egg and vanilla, beating until well blended. Combine flour, baking soda and salt; gradually beat into butter mixture. Stir in chocolate chips and nuts, if desired. Drop by rounded teaspoons onto ungreased cookie sheet.
3. Bake 10 to 12 minutes or until lightly browned. Cool slightly; remove from cookie sheet to wire rack. Cool completely. Makes about 42 cookies.