Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Dice the sweet potato into 1-inch cubes and trim the tough, woody ends off the asparagus spears.
Place the chicken breast, sweet potato cubes, and asparagus on the prepared baking sheet in a single layer.
Mince the garlic clove and finely chop the fresh rosemary leaves.
Drizzle the extra virgin olive oil over the chicken and vegetables, ensuring everything is lightly coated.
Sprinkle the minced garlic, chopped rosemary, sea salt, and black pepper evenly across the tray.
Squeeze the juice of the half lemon over the chicken and vegetables, then place the squeezed lemon hull on the tray to infuse more aroma.
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 fork-tender.
Remove from the oven and let the chicken rest for 5 minutes before slicing to ensure it stays juicy and succulent.