Preheat your oven to 400°F (200°C).
Slice the baby potatoes and carrots into small, uniform pieces for even cooking.
On a large rimmed baking sheet, toss the potatoes and carrots with half of the olive oil, sea salt, and black pepper.
Roast the root vegetables in the oven for 15 minutes.
While the vegetables roast, whisk together the remaining olive oil, lemon juice, lemon zest, minced garlic, oregano, and thyme in a small bowl.
Coat the chicken breast thoroughly with the lemon-herb mixture.
Remove the baking sheet from the oven and add the chicken and trimmed asparagus to the tray.
Return to the oven and roast for an additional 15 to 20 minutes until the chicken reaches an internal temperature of 165°F and the vegetables are golden and tender.