Generously sprinkle salt and pepper on chicken, rub in well, including under the wings and drumsticks.
Toss the veggies in olive oil, then scatter the potatoes, brussel sprouts and red onion around the chicken.
Slice butter into small chunks and spread over top the chicken.
Bake for approximately 1 hour, 10 minutes, or until the internal temperature registers at least 165°F. Add the broccoli and cherry tomatoes for the last 15 minutes of baking.