Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper.
Halve the baby potatoes and trim the woody ends off the asparagus spears.
In a small mixing bowl, whisk together the olive oil, lemon juice, lemon zest, minced garlic, rosemary, thyme, salt, and pepper.
Place the chicken breast and halved potatoes on the baking sheet and brush with two-thirds of the lemon-herb oil mixture.
Roast for 15 minutes, then remove the pan and add the asparagus to the empty space, drizzling it with the remaining herb oil.
Return the pan to the oven and roast for another 10-12 minutes 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 and serving alongside the roasted vegetables.