This sheet pan za’atar chicken thighs and vegetables is a great introduction to the flavor of za’atar, a warm spice blend from the Middle East, usually a combination of sesame seeds, sumac, thyme, and oregano, and possibly sea salt. Chicken thighs roast on a bed of zucchini, yellow summer squash, red bell pepper, and red onion, and if you like, cherry tomatoes. If you already know you love za’atar, feel free to add more!