Preheat your oven to 400°F and line a large rimmed baking sheet with parchment paper for easy cleanup.
Wash the baby potatoes and cut them into halves; trim the woody ends off the asparagus spears.
In a small mixing bowl, whisk together the extra virgin olive oil, fresh lemon juice, lemon zest, dried oregano, garlic powder, sea salt, and black pepper.
Place the chicken breast, halved potatoes, and trimmed asparagus onto the prepared baking sheet.
Mince the fresh garlic clove and sprinkle it evenly over the chicken and vegetables.
Drizzle the lemon-herb oil mixture over all components on the tray, using your hands or a brush to ensure the chicken is fully coated and the vegetables are tossed well.
Roast in the center of the oven for 20-25 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 to keep it juicy.