Preheat oven to 475°; add half the potatoes to a large pot, add water to cover potatoes with at least 2 inches of water + 2 tsp salt; bring to a boil over high; cook 10-12 min til tender, then drain + spread on a sheet pan; smash potatoes, drizzle with 2-3 tbsp oil + salt/pep; roast 10 min, flip + roast 10-15 min til crispy

Heat a skillet over med heat, pour chicken + juice into pan, break up chicken with wooden spoon, heat 2 min, flip + cook 2-3 more until warmed

Empty sauce into a microwave-safe bowl, cover + heat 30-60 sec or until warm

Add potatoes to plates + drizzle on sauce; top each with chicken, crumbled cheese, finely chopped onions