Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper.
Peel the sweet potato and dice into 1/2-inch cubes, then chop the broccoli into uniform bite-sized florets.
Slice the chicken breast into 1-inch pieces to ensure they cook at the same rate as the vegetables.
In a large mixing bowl, combine the chicken, sweet potatoes, and broccoli.
Drizzle with olive oil and sprinkle with sea salt, black pepper, garlic powder, and dried rosemary, tossing thoroughly to coat every piece.
Spread the mixture in a single layer on the baking sheet, leaving space between items to allow for even browning.
Roast for 20 to 25 minutes, flipping the ingredients halfway through, until the chicken is fully cooked and the sweet potatoes are caramelized and tender.