Preheat your oven to 400°F and line a large sheet pan with parchment paper for easy cleanup.
Dice the sweet potato into 1/2-inch cubes, slice the carrots into rounds, and chop the red bell pepper into bite-sized pieces.
Place the chicken breast on one side of the prepared baking sheet and arrange the sweet potatoes, carrots, bell peppers, and broccoli florets on the other side.
Drizzle the olive oil evenly over the chicken and all the vegetables, tossing the vegetables slightly to ensure a light coating.
In a small bowl, mix the thyme, rosemary, garlic powder, sea salt, and black pepper, then sprinkle the herb blend over the chicken and vegetables.
Roast in the center of the oven for 20 to 25 minutes, or until the chicken reaches an internal temperature of 165°F and the sweet potatoes are fork-tender.
Remove from the oven and let the chicken rest for 5 minutes before slicing it into strips and serving alongside the roasted vegetables.