Preheat oven to 350F. Line two large baking sheets with parchment paper.
In a medium bowl, whisk together flour, cornstarch, baking soda and salt.
Place butter in a microwave safe bowl. Cook on high for 40-60 seconds or until melted.
Pour butter into a large bowl. Add granulated sugar and brown sugar.
Using an electric mixer on medium speed, cream butter and sugars until batter is smooth. Use a spatula to scrape down the sides of the bowl.
Add eggs and vanilla. Continue mixing on medium until the batter is smooth.
Add half of the flour mixture to the batter. Turn electric mixer to low and mix until the flour mixture starts to incorporate into the batter. As the flour mixture starts to incorporate, you can increase the speed of the electric mixer to medium. Use a spatula to scrape down the sides of the bowl as necessary.
Repeat with remaining flour mixture.
Add chocolate chips. Use a spatula to fold in chocolate chips.
Using a large spoon or your hands, shape approximately 2 tablespoons of dough into a ball. Place dough ball onto baking pan.
Repeat until the baking sheet is full. Leave 1.5 - 2 inches between cookies so they have room to spread when baking.
Place baking pan in preheated oven and bake for 10-12 minutes. The cookies will be done when they start to turn golden on the tops.
Remove pan from oven. Let cookies cool slightly and then transfer cookies to a wire rack to cool completely.
Repeat with the other baking sheet. Makes 24 cookies.
Enjoy!