1. Preheat oven to 350 degrees. In a large bowl, combine butter and sugars with a wooden spoon. Stir in egg and vanilla. Stir in flour, baking soda, and salt. Stir in chips. Transfer to a 10-inch cast-iron skillet; smooth top.
2. Bake until cookie is golden brown and just set in the center, about 18 to 20 minutes. Let cool 5 minutes.
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