Preheat over to 425°F. Prepare baking sheet by spraying with cooking spray. Season both sides of the chicken with black pepper and desired seasoning, set aside. Place Brussels sprouts in large bowl, drizzle with olive oil and sprinkle with pepper and desired seasoning. Toss to combine. Set aside.
Slice sweet potatoes in half lengthwise. Place sweet potatoes cut side down onto baking sheet. Spray tops with cooking spray. Bake in the oven for 20 minutes.
Remove sheet pan from oven and place chicken (smooth side down) and Brussels sprouts on sheet pan. Return to oven and bake for an additional 20 minutes. Flip chicken and Brussels sprouts and continue to bake for 10 minutes, or until chicken reaches internal temperature of 165°F, and the Brussels sprouts are crispy and sweet potatoes are cooked through.
Notes
If you decide to use chicken breasts instead of dark meat, just keep an eye on the chicken, it may be done sooner!Photo credit: Kaitlin Eckstein