Preheat your oven to 400°F (200°C) and line a large rimmed sheet pan with parchment paper for easy cleanup.
Cut the chicken breast into 1-inch bite-sized pieces to ensure they cook quickly and stay juicy.
Slice the zucchini into half-moons and trim the woody ends off the asparagus spears.
In a small mixing bowl, whisk together the extra virgin olive oil, lemon juice, minced garlic, dried oregano, dried thyme, sea salt, and black pepper.
Place the chicken, zucchini, and asparagus on the prepared sheet pan.
Drizzle the lemon-herb marinade over the chicken and vegetables, tossing thoroughly with your hands to ensure every piece is well-coated.
Thinly slice the half lemon into rounds and tuck them among the chicken and vegetables for extra aromatic flavor.
Spread the ingredients into a single layer, ensuring they are not overcrowded so the vegetables roast rather than steam.
Bake for 18 to 22 minutes, or until the chicken is cooked through to an internal temperature of 165°F and the vegetables are tender and lightly browned.