Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper for easy cleanup.
Pat the chicken breast dry with a paper towel to ensure the surface gets maximum crispiness during roasting.
In a small bowl, whisk together the olive oil, rosemary, thyme, garlic powder, sea salt, and black pepper.
Place the chicken, cubed sweet potatoes, and broccoli florets on the prepared pan, then drizzle with the herb oil mixture.
Toss everything thoroughly with your hands to ensure an even coating of fats and spices across all surfaces.
Spread the ingredients into a single layer, ensuring the chicken has enough space to roast rather than steam.
Roast for 20-25 minutes, or until the chicken reaches an internal temperature of 165°F and the potatoes are fork-tender.
Let the chicken rest for 5 minutes before slicing to keep the juices locked inside for a moist finish.