Sprinkle a few sesame seeds on top of the cookie dough in the center. (abrowntable.com)
Immediately after removing from the oven, decorate to top of the cookies with chocolate chips, pressing into the cookie a little bit so that the chocolate chips set. (layersofhappiness.com)
Using small offset spatula, spread bittersweet chocolate over top of cookie in thin even layer. (epicurious.com)