Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper for easy cleanup.
Wash and 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 sheet pan.
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 10 minutes, then add the cherry tomatoes to the pan.
Continue roasting for another 10-15 minutes, or until the chicken reaches an internal temperature of 165°F and the potatoes are fork-tender and golden.
Remove from the oven and let the chicken rest for 5 minutes before slicing.
Garnish the entire dish with freshly chopped parsley and an extra squeeze of lemon if desired.