Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper for easy cleanup.
Wash and peel the sweet potato, then dice it into uniform 1/2-inch cubes to ensure even cooking.
Chop the broccoli into bite-sized florets and finely mince the garlic clove.
Place the chicken breast, cubed sweet potatoes, and broccoli florets onto the prepared baking sheet.
Drizzle the olive oil over the chicken and vegetables, then sprinkle evenly with the minced garlic, dried rosemary, sea salt, and black pepper.
Use your hands or tongs to toss everything together until every piece is well-coated in the oil and herbs.
Arrange the ingredients in a single layer, ensuring the chicken has enough space around it to roast properly.
Roast in the center of the oven for 20 to 25 minutes, or until the chicken reaches an internal temperature of 165°F and the sweet potatoes are tender and golden.
Remove from the oven and let the chicken rest for 5 minutes before slicing to keep it juicy.
Serve the sliced chicken alongside the roasted vegetables for a clean and satisfying meal.