Preheat oven to 180ºC . In a large bowl, sift together flour, baking soda, and salt. Scrape vanilla bean seeds from pods into standing electric mixer, reserving pods for another use if desired, and add butter and sugars, beating until light and fluffy. One at a time, beat in eggs, beating well after each addition, and beat in vanilla extract. Add flour mixture and beat until dough just comes together. Stir in chocolate chips or chunks and walnuts (do not overmix). Form dough into 4 cm balls and arrange about 5 cm apart on parchment-lined baking sheet. Flatten balls slightly with a metal spatula and bake cookies in batches in middle of the oven until golden, dozen to 15 minutes. Transfer cookies with spatula to racks to cool.