#1 Preheat oven to 350¡F. Line baking sheet with parchment paper #2 In a large bowl add butter, sugars, egg, vanilla extract. Stir until well combined #3 Mix in flour, cornstarch, baking soda and salt #4 Next, fold in the chocolate chips #5 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 #6 Allow cookies to cool on the baking sheet for about 5 minutes before serving.