Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Halve the baby potatoes and trim the tough, woody ends off the asparagus spears.
Mince the garlic clove and finely chop the fresh rosemary and thyme leaves.
Place the chicken breast, halved potatoes, and asparagus on the prepared baking sheet.
Drizzle the olive oil over the chicken and vegetables, then squeeze the juice of half the lemon over everything.
Sprinkle the minced garlic, chopped herbs, sea salt, and black pepper across the pan and toss well to ensure an even coating.
Slice the remaining half of the lemon into thin rounds and layer them directly onto the chicken breast.
Roast in the center of the oven for 20 to 25 minutes, or until the chicken reaches an internal temperature of 165°F and the potatoes are fork-tender.
Let the chicken rest for 5 minutes before serving to keep it juicy.