Preheat oven to 350°.
In the bowl of a stand mixer, cream the butter and sugars until very pale and creamy, approximately 3-5 minutes.
Add the vanilla and eggs. Blend well.
In a separate bowl, whisk together the flour, baking soda and salt.
One cup at a time, add the the dry ingredients to the butter mixture and blend just enough to combine. Do NOT overmix.
Stir in the chocolate chips one cup at a time.
Drop dough by rounded measuring tablespoons, about 2-inches apart onto ungreased cookie sheet.
Bake 9-12 minutes or until light brown, turning the tray at the halfway point.
Cool on the tray slightly.
Remove from cookie sheet, cool on wire rack.