Roast Chicken with Rosemary

Preheat oven to 350 degrees F (175 degrees C).
Season chicken with salt and pepper to taste. Stuff with the onion and rosemary. Place chicken in a 9x13 inch baking dish or roasting dish.
Roast in the preheated oven for 2 to 2 1/2 hours, or until chicken is cooked through and juices run clear. Cooking time will vary a bit depending on the size of the bird.