Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper for easy cleanup.
Chop the potato, carrots, and red bell pepper into uniform bite-sized pieces and break the broccoli into small florets.
Place the chicken breast on one side of the baking sheet and arrange the chopped vegetables in a single layer on the remaining space.
Drizzle the olive oil over the chicken and the vegetables, ensuring even coverage.
Sprinkle the dried oregano, garlic powder, sea salt, and black pepper over everything on the tray.
Toss the vegetables with your hands or a spatula and rub the seasoning into the chicken breast to ensure it is well-coated.
Roast in the center of the oven for 20 to 25 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are tender and lightly caramelized.
Remove from the oven and let the chicken rest for 5 minutes before slicing it into strips.
Garnish the entire dish with freshly chopped parsley and serve immediately or portion into containers for meal prep.