Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Peel and dice the sweet potato into 1/2-inch cubes. Toss them on the baking sheet with half of the olive oil and a pinch of sea salt.
Roast the sweet potatoes for 10 minutes to give them a head start.
While the potatoes roast, whisk together the maple syrup, dijon mustard, garlic powder, and remaining sea salt and black pepper in a small bowl.
Remove the baking sheet from the oven. Move the potatoes to one side and place the chicken breast and broccoli florets on the other side.
Drizzle the remaining olive oil over the broccoli and brush the maple-dijon glaze generously over the chicken breast.
Return the tray to the oven and roast for another 15-20 minutes, or until the chicken reaches an internal temperature of 165°F and the potatoes are tender.
Let the chicken rest for 5 minutes before slicing and serving alongside the roasted vegetables.