Step 1

Preheat your oven to 350°F.

Step 2

Place the chicken on a bed of thick onion slices in a roasting pan. Season the chicken generously inside and out with onion powder, salt, and pepper.

Step 3

Insert 3 tablespoons of butter and the whole garlic cloves into the cavity of the chicken. Cut the celery stalk into 3 or 4 pieces and add them to the cavity as well. Spread the remaining butter over the chicken's exterior.

Step 4

Transfer the pan to the preheated oven. Roast the chicken uncovered for approximately 1 hour and 15 minutes, or until the juices run clear and an instant-read thermometer inserted into the thickest part of the thigh registers 165°F.

Step 5

Remove the chicken from the oven and baste it with the pan drippings. Cover the chicken with aluminum foil and let it rest for about 30 minutes before carving and serving. Enjoy the flavorful roast chicken with the aromatic onions and garlic!