Best Gooey Chewy Cookies LevainStyle at Home

Ingredients

• 1 cup (2 sticks / 227g) unsalted butter, cold, cut into ½-inch cubes
• ¾ cup (150g) granulated sugar
• ¾ cup (170g) packed light brown sugar
• 2 large eggs, cold
• 1 teaspoon pure vanilla extract
• 2 ½ cups (300g) all-purpose flour
• 1 teaspoon baking soda
• 1 teaspoon cornstarch
• ½ teaspoon salt
• 1 ½ cups (approx. 300g) semi-sweet chocolate chunks (or coarsely chopped chocolate bar)
• ½ cup (approx. 100g) walnuts, roughly chopped (optional)