Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper for easy cleanup.
Wash and halve the baby potatoes, and snap off the woody ends of the asparagus spears.
In a small mixing bowl, whisk together the olive oil, lemon juice, lemon zest, minced garlic, rosemary, thyme, sea salt, and black pepper.
Place the chicken breast, halved potatoes, and asparagus on the prepared sheet pan in a single layer.
Drizzle the lemon-herb marinade over the chicken and vegetables, using your hands or a brush to ensure everything is evenly coated.
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 golden and fork-tender.
Remove from the oven and let the chicken rest for 5 minutes before slicing to keep the juices locked in.