1 1/4 pounds Bittersweet disks, at least 60 percent cacao content
2 teaspoons Pure vanilla extract
2 Large eggs
1 1/4 cups Granulated sugar
1 1/4 cups Light brown sugar
2 1/2 sticks Unsalted butter
1 1/2 teaspoons Coarse salt
1 1/2 teaspoons Baking powder
1 1/4 tablespoons Baking soda
1 2/3 cups Bread flour
1 2/3 cups Cake flour