2 cups minus 2 tablespoons cake flour
1 2/3 cups 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, room temperature
1 1/4 cups light brown sugar, packed
1 cup plus 2 tablespoons granulated sugar
2 large eggs, room temperature
2 teaspoons pure vanilla extract
1 1/3 pounds bittersweet chocolate disks or fèves, at least 60 percent cacao content (now, I did not have these, so I used Guittard 60% cocoa bittersweet chocolate chips, as well as about 1/2 pound of semi-sweet Guittard chocolate pieces, which I chopped – I loved the look and texture of this combination)
sea salt or fleur de sel, for sprinkling