Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Pat the chicken breast dry with a paper towel and cut it into bite-sized cubes for even roasting.
Peel and dice the sweet potato into 1/2-inch cubes and chop the broccoli into small florets.
In a large mixing bowl, combine the chicken, sweet potatoes, and broccoli.
Drizzle with olive oil and sprinkle with rosemary, thyme, garlic powder, sea salt, and black pepper.
Toss everything together until the ingredients are thoroughly and evenly coated with the oil and spices.
Spread the mixture in a single layer on the prepared baking sheet, ensuring there is enough space for the vegetables to roast rather than steam.
Roast in the center of the oven for 20-25 minutes, or until the chicken is cooked through and the sweet potatoes are tender.
Remove from the oven and let the dish rest for 3 minutes before serving.