Preheat your oven to 400°F (200°C).
Dice the baby potato into small cubes and trim the tough, woody ends off the asparagus spears.
In a small bowl, whisk together the olive oil, minced garlic, dried oregano, dried thyme, sea salt, and black pepper.
Place the chicken breast, diced potatoes, and asparagus on a large sheet pan lined with parchment paper.
Drizzle the herb oil mixture over the chicken and vegetables, tossing them well to ensure everything is evenly coated.
Slice the half lemon into thin rounds and layer them directly on top of the chicken and asparagus.
Roast in the oven for 20-25 minutes, or until the chicken reaches an internal temperature of 165°F and the potatoes are tender and golden.
Remove from the oven and let the chicken rest for 5 minutes before slicing to keep it juicy.