Preheat oven to 350° F and line baking sheet with parchment paper or spray with nonstick cooking spray.
In a stand mixer, or with electric beaters, cream together butter, brown sugar, and sugar. Add vanilla and eggs and mix until combined.
Add flour, baking soda, salt, and corn starch and mix on low until thoroughly combined. Mix in chocolate chips.
Using cookie scoop, or tablespoon, drop dough balls onto prepared cookie sheets. Bake at 350° F for 9-11 minutes, being sure not to over bake. Cookies will come out of oven looking slightly underdone in the center with slightly browning edges.
Let cool on baking sheet for about 5 minutes then transfer to wire cooling rack to cool completely.