Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper.
Peel and cube the sweet potato into half-inch pieces and thinly slice the red onion.
Toss the sweet potatoes and red onion on the pan with half of the olive oil, a pinch of sea salt, and black pepper.
Roast the vegetables for 10 minutes to give them a head start.
While vegetables roast, season the chicken breast with garlic powder and the remaining salt and pepper.
Remove the pan from the oven, move the potatoes to one side, and add the chicken breast and broccoli florets.
Drizzle the remaining olive oil over the broccoli and return the pan to the oven for 15-18 minutes until the chicken is cooked through.
Remove from the oven, slice the chicken into bite-sized pieces, and toss it in the barbecue sauce.
Assemble the bowl by layering the roasted sweet potatoes, onion, and broccoli, then top with the saucy chicken and fresh cilantro.