NYT Cooking: This one-pan meal gets dinner on the table in no time. It's simple enough for a weeknight, but impressive enough to serve at a dinner party. Chicken thighs are quickly marinated in garlic, olive oil and za’atar, if you'd like, while the oven comes to temperature. Then, they're roasted alongside thick wedges of shallots and sweet grapes, whose flavors are gently coaxed together and given some ex...