In a medium bowl combine the flour, cornstarch, salt and baking soda and set aside

In a bowl of a stand mixer or large bowl and using a hand mixer, cream together the melted butter and sugars until light and fluffy, about 4 min. Add in the eggs 1 at a time until combined then add in the vanilla extract and mix again. Fold in the chocolate chips with a spatula. Chill the batter for 2 hours up to a day. Dough can also be frozen then thawed enough to be formed into balls before baking

When ready to bake preheat oven to 350 Deg F. Scoop out 2 tablespoon sized balls of dough and place on a baking sheet that is covered either with parchment or a silicon bake mat. Bake for 9-10 min or until edges are starting to brown and middles are still soft. Do not over bake

Let cool for a couple minutes on the baking sheet then carefully remove to a wire cooling rack to cool completely. Store in an airtight container up to 1 week or in the freezer for a few months.