Classic Roast Chicken

Pat chicken dry and season all over with salt and pepper. Tie legs together and tuck wing tips under the body of the chicken. (If you have time, let rest in fridge for 1 hour, or up to overnight.) Preheat oven to 425°. Fill a 9"-x-13" baking dish with onion, carrots, celery, potatoes, and garlic and toss together with oil and 1 teaspoon salt. Place chicken on top. Brush chicken all over with melted butter and stuff cavity with lemon and most of the thyme, reserving a couple sprigs for garnish.