Preparation Preheat oven to 500°F with rack in upper third. Mix oil with spices, 1 1/2 teaspoons salt, and 1 teaspoon pepper in a large bowl, then add chicken and onion, tossing to coat. Arrange chicken, skin side up, and onion in a 3-quart shallow baking dish. Bake until chicken is just cooked through and skin is golden, about 30 minutes. Skim any fat from pan juices in dish.
Preparation Preheat oven to 500°F with rack in upper third. Mix oil with spices, 1 1/2 teaspoons salt, and 1 teaspoon pepper in a large bowl, then add chicken and onion, tossing to coat. Arrange chicken, skin side up, and onion in a 3-quart shallow baking dish. Bake until chicken is just cooked through and skin is golden, about 30 minutes. Skim any fat from pan juices in dish.