Preheat grill to high + oil grates; cut potatoes into eighths, then toss with 1 tbsp oil + salt/pep; add potatoes to piece of foil + wrap tightly; grill in foil 28-30 min with lid closed, until tender, flipping over halfway through

Meanwhile, toss green beans with 1 tbsp oil + salt/pep; wrap beans in foil; grill with lid closed, 10-12 min until tender, flipping halfway

Rub chicken with 1 tbsp oil, salt/pep + seasoning blend; grill 5-7 min with lid closed, flip + grill 5-7 min more until fully cooked

Grill scallions about 4 min until charred + chop up; toss potatoes, beans + scallions in a bowl with 3-4 tbsp dressing; serve alongside chicken