Instructions

• Preheat the oven to 475°F.
• Line baking sheets with parchment paper.
• Whisk the flour, cornstarch, salt, and baking soda together in a small bowl.
• Cut the cold butter into small pieces.
• In a large bowl, combine the butter, granulated sugar, brown sugar, egg, and vanilla.
• Gently stir the dry ingredients into the butter mixture until combined.
• Fold in the chocolate chips and optional walnuts.
• Scoop tablespoon-size balls of dough onto the prepared baking sheets.
• Bake for 6 to 7 minutes, until the tops are golden brown.
• Remove from the oven and let the cookies cool on the baking sheet; the centers continue cooking as they cool.
• For the softest texture, serve the cookies warm rather than fully cooled.