Preheat your oven to 375°F and line a large baking sheet with parchment paper.
In a stand mixer fitted with the paddle attachment, cream together the butter, light brown sugar, and granulated sugar on medium speed for 3 minutes.
Add the eggs, vanilla extract, baking soda, salt, and cornstarch.
Mix for 1 minute, scraping the bowl as needed.
Reduce the mixer speed to low and mix in the flour until just combined.
Stir in the chocolate chips by hand.
Scoop out a rounded 1/3 cup of cookie dough and form it into a ball.
Split the dough ball in half, then press the halves back together with the jagged edges facing up to create a textured top.
Place the cookie dough balls on the prepared baking sheet, spacing them 3 inches apart.
Bake for 10-11 minutes, until the edges and tops are slightly golden.
After baking, press additional chocolate chips onto the tops of the cookies for a bakery-style look.
Let the cookies cool on the baking sheet for 5 minutes, then transfer them to a wire rack to cool completely.