Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper.
Halve the baby potatoes and trim the woody ends off the asparagus.
In a small bowl, whisk together the olive oil, lemon juice, lemon zest, minced garlic, oregano, sea salt, and black pepper.
Place the chicken breast, halved potatoes, asparagus, and cherry tomatoes onto the prepared sheet pan.
Drizzle the lemon-herb dressing over the chicken and vegetables, tossing them gently to ensure everything is evenly coated.
Spread the ingredients into a single layer, ensuring the chicken is in the center.
Bake for 20 to 25 minutes, or until the chicken reaches an internal temperature of 165°F and the potatoes are fork-tender.
Remove from the oven and let the chicken rest for 5 minutes before slicing and serving.