Preheat your oven to 400°F and line a large rimmed sheet pan with parchment paper.
Peel the sweet potato and dice into 1/2-inch cubes; slice the carrots into rounds and chop the bell pepper into bite-sized pieces.
Mince the garlic cloves and finely chop the fresh rosemary leaves.
Place the chicken breast, diced sweet potatoes, broccoli, carrots, and peppers onto the prepared sheet pan.
Drizzle the entire pan with extra virgin olive oil and sprinkle with the minced garlic, rosemary, sea salt, and black pepper.
Toss everything thoroughly with your hands or tongs to ensure an even coating of oil and seasoning, then spread into a single layer.
Roast for 20 to 25 minutes, or until the chicken reaches an internal temperature of 165°F and the sweet potatoes are fork-tender.
Let the chicken rest for 5 minutes before slicing to ensure it stays juicy, then serve alongside the roasted vegetables.