Beat cold butter, brown sugar, and white sugar together on high speed for 2-3 minutes until fluffy
Add eggs one at a time while mixing
Reduce mixer speed and add vanilla
In a separate bowl, whisk together flour, salt, baking soda, and corn starch
Add dry ingredients to wet ingredients on low speed, adding slowly in portions
Coat chocolate chips in remaining flour mixture and fold into dough
Refrigerate dough if using room temperature butter
Scoop dough onto baking sheet
Bake at 380°F for 9 minutes until golden brown peaks form
Cool on rack for about 20 minutes until just barely warm to touch
