Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Slice the fingerling potatoes in half lengthwise and trim the woody ends off the asparagus.
Finely mince the garlic, rosemary, and thyme.
In a small bowl, whisk together the olive oil, lemon juice, lemon zest, minced garlic, rosemary, thyme, salt, and pepper.
Place the halved potatoes on one side of the baking sheet and drizzle with half of the lemon-herb oil mixture, tossing to coat evenly.
Roast the potatoes for 10 minutes.
Remove the tray from the oven and place the chicken breast in the center and the asparagus on the other side.
Brush the remaining lemon-herb oil over the chicken and asparagus.
Return the tray to the oven and roast for an additional 15-20 minutes, or until the chicken reaches an internal temperature of 165°F and the potatoes are golden brown.
Let the chicken rest for 5 minutes before slicing to ensure it stays juicy.