Step 1

Preheat oven to 375 degrees F. In a large bowl beat butter and shortening with an electric mixer on medium to high speed for 30 seconds. Add brown sugar, granulated sugar, baking soda, and salt. Beat until combined, scraping sides of bowl occasionally. Beat in eggs and vanilla until combined. Beat in as much of the flour as you can with the mixer. Stir in any remaining flour, the chocolate pieces, and nuts.

Step 2

Drop dough by rounded teaspoons 2 inches apart onto ungreased cookie sheets. Bake for 8 to 9 minutes or just until edges are light brown. Cool on cookie sheets for 2 minutes. Transfer to wire racks; cool.