White Chocolate Chip Cookies

Name: White Chocolate Chip Cookies
Prep time: 10 min
Cook time: 10 min
Total time: 20 min
Cuisine: American
Ingredients: 2 ¼ cups (280g) all purpose flour; 2 teaspoons cornstarch; 1 teaspoon baking soda; ½ teaspoon salt; ¾ cup 1 1/2 sticks, 170 g) unsalted butter (melted and slightly cooled); ¾ cups (160g) packed light brown sugar; ½ cup (100 g) granulated white sugar; 1 large egg (room temperature); 1 large egg yolk; 2 teaspoons pure vanilla extract; 1 ¼ cups white chocolate chips