- Cut potatoes in half lengthwise; cut each piece crosswise into 1/2-inch thick slices. Place with onion in large, shallow foil-lined baking pan.
- Combine next 7 ingredients; drizzle 1 Tbsp. mixture over potato mixture and toss until evenly coated.
- Discard giblets and neck from chicken. Rinse chicken under cold running water; drain and pat dry. Place chicken, breast side up, in center of pan, moving potatoes aside. Brush chicken, including cavity, thoroughly with soy sauce mixture.
- Roast in 375ºF. oven about 1 hour and 15 minutes, or until meat thermometer inserted into thickest part not touching bone registers 180º, brushing chicken with soy sauce mixture every 30 minutes and stirring vegetables.
- Remove from oven; let chicken stand 10 minutes before carving.
- Serve with potatoes.