preheat oven to 400° F
In a large roasting pan spray with nonstick spray, arrange the chicken along with the sweet potato wedges, they will be touching but try to get them to lay in a single layer. Do your best but don't stress over it.
in a small bowl, mix the rest of the ingredients above the final basting together, except the scallions and sesame seeds. Pour mixture over the chicken and potatoes, turning everything over so the chicken and potatoes are well coated. Finishing with the chicken skin side up.
roast for 45 minutes, basting every so often, turning the sweet potatoes over.
in a small bowl mix the basting ingredients together and set aside
about 15 minutes before the end of the cooking time, take the pan out of the oven, add the scallions, pouring the final basting mixture over everything, return the pan to the oven. If using the scallions they should become soft and slightly charred.
Transfer the chicken and vegetables to a warmed platter and sprinkle with the sesame seeds. Serve immediately.