Using two teaspoons or a #40 spring-loaded ice cream scoop, form the dough into 1-1/2-inch balls and place at least 2 inches apart on the prepared baking sheets. Top each cookie with a few flakes of flaky salt, a few oats, and a chocolate chunk or two. Bake the cookies for 5 minutes and rotate the pans from front to back and top to bottom, then bake until puffed and slightly cracked on top and set around the sides, 8 to 10 minutes. (Although they will seem underdone and soft at first, they will firm up as they cool.) Let cool completely, then devour.