Whisk together flour (2 1/4 cups), cornstarch (2 teaspoons), baking soda (1/2 teaspoon), and salt (1 teaspoon) in a small bowl and set aside.
In a large mixing bowl, using a handheld mixer, cream together the butter (14 tablespoons), granulated sugar (3/4 cup), and brown sugar (1/4 cup) on medium speed until light and fluffy.
Add the vanilla (2 teaspoons) and eggs (2). Cream until well combined, about 1 minute. Add flour mixture just until combined.
Add chocolate chips (1 1/2 cups) and mix until evenly distributed through the dough.
Scoop out the dough, using a medium cookie scoop. Place on cookie sheet. Add extra chocolate chips to the top of the balls for a "bakery" look if desired. Refrigerate dough balls for 1 hour minimum. (Don't skip).
Preheat oven to 350 °F (177 °C). Line baking sheets with parchment paper.
Arrange cookie dough balls 2 inches apart on prepared baking sheets. Do not flatten. Using your fingers lightly tighten the bottom edge of the cookie where it sits on the baking sheet. (this helps them puff up more and not flatten as easily).
Refrigerate the dough by scooping out the next batch to keep it cold.
Bake in preheated oven for approximately 12-14 minutes or until the edges are beginning to brown. The center of the cookies will look slightly underdone in the center. Do not overbake or they will dry out!
Cool for 10 minutes on the baking sheet. Transfer to cool completely on a wire baking rack. They will slightly deflate as they cool. Enjoy!