2 cups minus 2 tablespoons (8 1/2 ounces) cake flour 1 2/3 cups (8 1/2 ounces) bread flour 1 1/2 teaspoons baking powder 1 1/4 teaspoons baking soda 1 1/2 teaspoons coarse salt 2 1/2 sticks (1 1/4 cups) unsalted butter 1 1/4 cups (10 ounces) light brown sugar 1 cup plus 2 tablespoons (8 ounces) granulated sugar 2 large eggs 2 teaspoons vanilla extract 1 1/4 pounds bittersweet chocolate disks or fèves, at least 60 percent cacao content

When ready to bake, preheat oven to 350F degrees. Sprinkle lightly with sea salt and bake until golden brown but still soft, 18 to 20 minutes.