Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Dice the sweet potato into 1/2-inch cubes and trim the tough, woody ends off the asparagus spears.
Mince the garlic and finely chop the fresh rosemary.
In a large mixing bowl, combine the chicken breast, cubed sweet potato, asparagus, and cherry tomatoes.
Drizzle with extra virgin olive oil and sprinkle with the minced garlic, rosemary, sea salt, and black pepper.
Toss everything thoroughly to ensure the chicken and vegetables are evenly coated in the oil and seasonings.
Spread the mixture in a single layer on the prepared baking sheet, ensuring the chicken is not crowded by the vegetables.
Roast 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 drizzle the fresh lemon juice over the entire tray before serving.