Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper for easy cleanup.
Cut the chicken breast into 1-inch bite-sized pieces and peel and cube the sweet potato into 1/2-inch pieces.
In a large mixing bowl, toss the chicken and sweet potato cubes with olive oil, sea salt, black pepper, garlic powder, and dried rosemary until evenly coated.
Spread the mixture in a single layer on the prepared baking sheet, ensuring pieces aren't crowded to achieve maximum crispiness.
Roast for 15 minutes, then remove the pan and add the broccoli florets, tossing them with the residual oil on the pan.
Return to the oven and roast for an additional 10-12 minutes until the chicken is cooked through and the potatoes have a golden exterior.
Let the dish rest for 2 minutes before serving to allow the juices to redistribute.