Preheat oven to 350F. Line baking sheet with parchment paper
In a large bowl add butter, sugars, egg, vanilla extract. Stir until well combined
Mix in flour, cornstarch, baking soda and salt
Next, fold in the chocolate chips
Using an ice cream scooper, place dough balls onto the baking sheet, and spread evenly. Bake for 10 to 12 minutes, or until edges are light golden brown
Allow cookies to cool on the baking sheet for about 5 minutes before serving
