Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper.
In a small mixing bowl, whisk together 0.5 tablespoon of olive oil, the lemon juice, lemon zest, minced garlic, dried oregano, sea salt, and black pepper.
Pat the chicken breast dry with a paper towel and place it on one side of the prepared baking sheet, then brush the lemon-herb mixture evenly over the chicken.
Trim the woody ends off the asparagus and place them on the other side of the baking sheet along with the cherry tomatoes.
Drizzle the remaining 0.5 tablespoon of olive oil over the vegetables and toss gently to coat, spreading them out in a single layer.
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 vegetables are tender and slightly charred.
Remove from the oven and let the chicken rest for 5 minutes before slicing to ensure the juices redistribute for maximum tenderness.
Plate the sliced chicken alongside the roasted vegetables and drizzle any remaining pan juices over the top before serving.