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Preheat the oven to 350°F. Line a 9x9-inch baking pan with parchment paper.
In a medium bowl, whisk together the flour, cornstarch, baking soda, and salt.
In a large mixing bowl, combine the brown sugar, granulated sugar, melted butter, egg, egg yolk, and vanilla. Whisk together until the mixture is thick and well combined
Add the dry mixture to the wet mixture and stir together with a spatula until almost combined. Add the white chocolate chips and stir until they are well distributed.
Transfer the dough to the prepared baking pan and spread into an even layer. Sprinkle a few more chocolate chips on top, if desired
Bake for about 35 minutes or until the edges are set and golden brown and a toothpick inserted into the center comes out with a few crumbs. Let the cookie bars cool completely in the pan before cutting.