Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper for easy cleanup.
Peel and dice the sweet potato into 1/2-inch cubes, chop the bell pepper into bite-sized pieces, and break the broccoli into small florets.
Mince the garlic clove finely.
In a large mixing bowl, toss the sweet potato, broccoli, and bell peppers with 0.5 tbsp of the olive oil and half of the salt and pepper.
Spread the seasoned vegetables in a single layer on one side of the prepared baking sheet.
Rub the chicken breast with the remaining 0.25 tbsp of olive oil, minced garlic, rosemary, thyme, and the remaining salt and pepper.
Place the chicken breast on the other side of the baking sheet, ensuring it is not overcrowded by the vegetables.
Roast in the oven for 20-25 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are tender and lightly browned.
Remove from the oven and let the chicken rest for 5 minutes before slicing to ensure it stays juicy and flavorful.