Preheat your oven to 400°F and line a large baking sheet with parchment paper for easy cleanup.
Halve the baby potatoes and trim the woody ends off the asparagus spears.
Finely mince the garlic clove and chop the fresh rosemary leaves.
In a small mixing bowl, whisk together the extra virgin olive oil, lemon juice, lemon zest, minced garlic, rosemary, sea salt, and black pepper.
Place the chicken breast, halved potatoes, and asparagus on the prepared baking sheet.
Drizzle the lemon-herb oil mixture over the chicken and vegetables, tossing the produce and coating the chicken thoroughly to ensure maximum flavor.
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 potatoes are fork-tender.
Remove from the oven and let the chicken rest for 5 minutes before slicing to keep the meat juicy.