Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper for easy cleanup.
Pat the chicken breast completely dry with a paper towel to ensure the exterior becomes extra crispy during roasting.
Slice the carrots into thin rounds and break the broccoli into bite-sized florets.
In a large mixing bowl, whisk together the olive oil, lemon juice, dried oregano, garlic powder, sea salt, and black pepper.
Add the chicken breast and vegetables to the bowl, tossing thoroughly until every piece is evenly coated in the herb oil.
Arrange the chicken and vegetables in a single layer on the prepared baking sheet, ensuring they are not crowded.
Roast for 20 to 25 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are tender with slightly charred edges.
Remove from the oven and let the chicken rest for 5 minutes before slicing to keep the meat juicy and flavorful.