If you grew up in a Middle Eastern household you don't need to be told to put za'atar on popcorn because you already put it on everything. For the rest of you, try putting this woodsy spice mix made with sumac, sesame seeds, thyme, and oregano on your chips. Our potato chip flavorings all work on popcorn, too—make sure to toss the popcorn with butter or oil first so that the za'atar will stick.