Preheat your oven to 400°F and line a large sheet pan with parchment paper.
Pat the chicken breast completely dry with paper towels to ensure a golden sear and even cooking.
In a small glass bowl, whisk together the olive oil, lemon juice, lemon zest, oregano, garlic powder, sea salt, and black pepper.
Place the chicken breast on one side of the sheet pan and brush generously with half of the lemon-herb mixture.
Trim the woody ends off the asparagus and place the spears and cherry tomatoes on the other side of the pan, tossing them with the remaining lemon-herb mixture.
Roast for 20 to 25 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are tender.
Remove from the oven and let the chicken rest for 5 minutes before slicing to keep it juicy, then serve immediately with the roasted vegetables.