01 - Set oven temperature to 350°F (175°C) and allow to fully preheat.
02 - Whisk flour, baking soda, and salt in a medium bowl and set aside.
03 - In a large mixing bowl, whisk together melted butter, brown sugar, and granulated sugar until the mixture is smooth.
04 - Add eggs one at a time to the butter-sugar mixture, whisking thoroughly after each addition, then stir in the vanilla extract.
05 - Gently fold the dry ingredients into the wet mixture using a spatula until just combined; avoid overmixing.
06 - Carefully fold chocolate chips into the cookie dough until evenly distributed.
07 - Lightly grease a 10-inch cast iron skillet with butter or non-stick spray.
08 - Spread the cookie dough evenly into the prepared skillet and smooth the surface with a spatula.
09 - Bake for 22 to 28 minutes, until the edges are golden and center is just set. The cookie will continue to bake slightly as it cools.
10 - Let the skillet cookie cool for 10 minutes before slicing or serving directly from the pan. For best results, enjoy warm; optionally top with vanilla ice cream.