In a bowl whisk together the flour, cornstarch, baking soda, and salt. Set aside.
In a separate bowl, use a stand mixer to cream together the butter and sugars (I just use the paddle attachment). Mix until light and creamy, about 5 minutes.
Then add the vanilla instant pudding mix powder to the butter/sugar. Mix until creamy.
Add the eggs, mixing in 1 at a time.
Mix in the vanilla.
Add the flour mixture into the butter mixture, combine.
Stir in the chocolate chips.
Drop the cookie batter by the large spoonful onto a parchment paper lined baking sheet.
Bake for 11 minutes. The edges of the cookies should look golden brown.