Anna Olson's Chewy Chocolate Chip Cookie Bars

Ingredients

• 1 cup unsalted butter, melted and cooled
• 1 cup packed light brown sugar
• ½ cup granulated sugar
• 2 large eggs
• 2 tsp vanilla extract
• 2¼ cups all-purpose flour
• ¼ cup cornstarch
• ¾ tsp baking soda
• ¾ tsp fine salt
• 1½ cups chocolate chips