Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper for easy cleanup.
Peel the sweet potato if desired, then dice it into 1/2-inch cubes; cut the chicken breast into similar bite-sized pieces.
In a large mixing bowl, combine the chicken, sweet potatoes, and broccoli florets.
Drizzle with extra virgin olive oil and sprinkle with minced fresh rosemary, garlic powder, sea salt, and black pepper.
Toss everything thoroughly until evenly coated in the oil and seasonings.
Spread the mixture in a single layer on the prepared baking sheet, ensuring the pieces are not overcrowded so they roast rather than steam.
Roast for 20 to 25 minutes, tossing the ingredients halfway through, until the chicken is golden and the sweet potatoes are tender.
Remove from the oven and serve immediately while hot.