Preheat your oven to 400°F and line a large rimmed baking sheet with parchment paper.
Halve the baby potatoes and trim the woody ends off the asparagus spears.
In a small mixing bowl, whisk together the extra virgin olive oil, lemon juice, lemon zest, minced garlic, dried oregano, sea salt, and black pepper.
Place the chicken breast, halved potatoes, and asparagus on the prepared baking sheet.
Drizzle the lemon-herb oil mixture over the chicken and vegetables, using your hands or a brush to ensure everything is evenly coated.
Roast in the center of the oven for 12 minutes, then remove the tray briefly to add the cherry tomatoes.
Return the tray to the oven and roast for another 10-13 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 to keep it juicy.
Plate the sliced chicken with the roasted potatoes, asparagus, and tomatoes, drizzling any remaining pan juices over the top.