Preheat the oven to 350 degrees, and line two baking sheets with parchment or non-stick sheet.

In a medium bowl, stir the flour, cornstarch, baking soda, salt, and cinnamon. Set aside.

In a large bowl, beat together the butter and both sugars until fluffy.

Beat in the eggs and vanilla until smooth.

Slowly add in the flour mixture until well combined. Fold in the chocolate chips and walnuts.

Scoop large 2 tablespoon-fulls onto your baking sheets. Bake for 8-10 minutes, or until edges are slightly golden.