In large mixing bowl, cream together cold cubed butter, brown sugar, and sugar for 4 minutes or until creamy.
Add eggs and vanilla, one at a time, mixing well after each one.
Sift all dry ingredients together in a separate bowl: flours, cornstarch, baking soda, and salt. Mix until just combined to avoid over mixing. Stir in chocolate chips and walnuts.
Scoop dough onto cookie sheet with a 2.66 oz scoop. Put in freezer for at least 30 minutes or until frozen.
Bake for 9-11 minutes on the middle rack of your oven.
Recipe Notes
For best results, use 2.66oz scoop (volrath green scoop)