Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Halve the baby potatoes and trim the woody ends off the asparagus spears.
In a small bowl, whisk together the extra virgin olive oil, lemon juice, 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 mixture over the chicken and vegetables, tossing well to ensure everything is evenly coated.
Arrange the ingredients in a single layer, ensuring the chicken is not covered by the vegetables.
Roast in the oven for 20 to 25 minutes, or until the chicken reaches an internal temperature of 165°F and the potatoes are fork-tender and golden.
Let the chicken rest for 5 minutes before slicing and serving alongside the roasted vegetables.