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 woody ends off the asparagus spears.
Finely mince the garlic cloves and chop the fresh rosemary and thyme leaves.
In a large mixing bowl, combine the chicken breast, sweet potato cubes, and asparagus.
Drizzle with olive oil and lemon juice, then sprinkle with the minced garlic, rosemary, thyme, sea salt, and black pepper.
Toss everything thoroughly until the chicken and vegetables are evenly coated in the oil and aromatics.
Spread the mixture in a single layer on the prepared baking sheet, ensuring the chicken has space around it to crisp up.
Roast for 20-25 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 and serving.