Preheat oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Halve the baby potatoes and slice the carrots into half-inch thick rounds.
Place the chicken breast, potatoes, and carrots on the prepared baking sheet in a single layer.
Drizzle everything with olive oil and squeeze the juice of half the lemon over the tray.
Mince the garlic, rosemary, and thyme, then sprinkle the mixture evenly over the chicken and vegetables.
Season the entire tray with sea salt and black pepper.
Roast for 15 minutes, then remove the tray and add the trimmed asparagus.
Return the tray to the oven and continue roasting for another 8-10 minutes until the chicken reaches an internal temperature of 165°F.
Serve the chicken and vegetables warm with the remaining lemon cut into wedges for squeezing.