Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper.
Peel the sweet potato and carrots, then dice them into 1/2-inch cubes to ensure even cooking.
Chop the broccoli into bite-sized florets and slice the red bell pepper into 1-inch pieces.
Mince the garlic clove and finely chop the fresh rosemary and thyme leaves.
Place the chicken breast and all the prepared vegetables onto the sheet pan.
Drizzle with olive oil and sprinkle with the minced garlic, fresh herbs, sea salt, and black pepper.
Toss everything thoroughly with your hands or tongs to coat each piece in oil and seasoning.
Spread the ingredients into a single layer, making sure the chicken breast is not covered by vegetables.
Roast in the center of the oven for 20 to 25 minutes, or until the chicken reaches an internal temperature of 165°F.
Remove from the oven and let the chicken rest for 5 minutes before slicing into strips and serving with the roasted vegetables.