Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Wash the baby potatoes and cut them into halves or quarters so they are uniform in size.
Trim the woody ends off the asparagus spears and set them aside.
In a small bowl, whisk together 0.5 tbsp of olive oil, lemon juice, minced garlic, rosemary, and thyme to create the marinade.
Place the potatoes on one side of the baking sheet, toss with 0.25 tbsp of olive oil, half the sea salt, and half the black pepper.
Roast the potatoes alone for 10 minutes to give them a head start on crisping.
Pat the chicken breast completely dry with a paper towel and season both sides with the remaining salt and pepper.
Remove the tray from the oven, place the chicken in the center, and arrange the asparagus on the remaining open space.
Brush the lemon-herb marinade generously over the chicken breast and drizzle any remaining over the asparagus.
Return the tray to the oven and roast for 18-22 minutes until the chicken reaches an internal temperature of 165°F and the potatoes are golden-brown.
Remove from the oven and let the chicken rest for 5 minutes before slicing to ensure it stays juicy.