Step 1

Preheat oven to 410 degrees.

Step 2

In a large mixing bowl, cream together cold cubed butter, brown sugar, and sugar for 4 minutes or until creamy.

Step 3

Add eggs, one at a time, mixing well after each one.

Step 4

Stir in flours, cornstarch, baking soda, and salt. Mix until just combined to avoid overmixing. Stir in chocolate chips and walnuts.

Step 5

Separate dough into large balls and place on lightly colored cookie sheet. They are bigger than you think! You will fit 4 cookies on one large cookie sheet. The dough makes 8 extra large cookies.

Step 6

Bake for 9-12 minutes or until golden brown on the top. Let them rest for at least 10 minutes to set.