Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Slice the sweet potato into thin, even wedges and chop the broccoli into bite-sized florets.
In a small ramekin, whisk together the dried rosemary, thyme, garlic powder, sea salt, and black pepper.
Arrange the chicken breast, sweet potato wedges, and broccoli florets in a single layer on the prepared baking sheet.
Drizzle the olive oil over the chicken and vegetables, tossing them gently to ensure everything is well-coated.
Sprinkle the herb seasoning blend evenly over the chicken and the vegetables.
Roast in the center of the oven for 20 to 25 minutes, or until the chicken is cooked through and the vegetables are tender with slightly charred edges.