Preheat the oven to 190°C.
Chop the sweet potatoes, potatoes into bite-sized chunks (no need to peel them, if they’re organic).
Place chicken in a large tray. Scatter the root vegetables around the chicken. Drizzle with the olive oil then sprinkle with the seasoning. Massage the vegetables and the chicken pieces well, then season to taste.
Roast the chicken and potatoes for 30 minutes.
Meanwhile cut the onion into 4 wedges and chop the bell pepper into bite-sized pieces.
Remove the tray from the oven and add the pepper and red onion to the potatoes, then toss well.
Return the tray to the oven and roast for 15 minutes more, until the chicken is cooked through & golden and the potatoes are tender.
Serve warm sprinkled with chopped herbs.