My cookies were just set after about 9 - 10 minutes (I have an older oven) and I put a few sprinkles of sea salt on the top of the warm cookies. (biggirlssmallkitchen.com)
Sprinkle a tiny bit of sea salt on top of each cookie dough ball. (kneadtocook.com)
Brush dough lightly with egg and sprinkle salt on top. (iheartnaptime.net)