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, then trim the woody ends off the asparagus spears.
In a small bowl, whisk together the olive oil, lemon juice, lemon zest, minced garlic, rosemary, thyme, sea salt, and black pepper.
Place the potatoes on the sheet pan, drizzle with half of the herb oil mixture, and toss to coat; roast for 10 minutes.
Move the potatoes to one side, add the chicken breast and asparagus to the pan, and brush everything with the remaining herb oil.
Return the pan to the oven and roast for 15 to 20 minutes, or until the chicken reaches an internal temperature of 165°F and the potatoes are golden.
Let the chicken rest for 5 minutes before slicing to ensure the juices stay locked in for a moist finish.