NY Times-Style Gluten Free Chocolate Chip Cookies

These gluten free New York Times Chocolate Chip Cookies taste exactly like the famous crispy-outside-chewy-inside cookies published by the Times in 2009. They have no equal!! FULL RECIPE: https://glutenfreeonashoestring.com/g... INGREDIENTS 3/4 cup (105 g) all purpose gluten free flour (I used Better Batter) 1/4 teaspoon xanthan gum (omit if your blend already contains it) 1 1/2 tablespoons (14 g) cornstarch 7/8 cup (122 g) Gluten Free Bread Flour (https://glutenfreeonashoestring.com/g...) 5/8 teaspoon baking soda 3/4 teaspoon baking powder 3/4 teaspoon kosher salt 1/2 cup + 2 tablespoons (120 g) granulated sugar 10 tablespoons (140 g) packed light brown sugar 10 tablespoons (140 g) unsalted butter, at room temperature 1 egg (50 g, weighed out of shell) at room temperature, beaten 1 teaspoon pure vanilla extract 10 ounces bittersweet chocolate disks Coarse salt, for sprinkling