Preheat your oven to 400°F (200°C) and line a small baking sheet with parchment paper.
In a small bowl, whisk together the extra virgin olive oil, lemon juice, dried oregano, garlic powder, sea salt, and black pepper.
Place the chicken breast on the baking sheet and brush both sides thoroughly with the prepared lemon-herb marinade.
Roast the chicken for 20 to 25 minutes, or until the internal temperature reaches 165°F and the edges are lightly golden.
While the chicken is roasting, steam the broccoli florets for 5 to 7 minutes until they are tender yet still bright green.
Warm the pre-cooked brown rice in a small saucepan or microwave and fluff it with a fork before placing it into a serving bowl.
Let the roasted chicken rest for 5 minutes to lock in the juices before slicing it into thin strips.
Arrange the sliced chicken and steamed broccoli over the rice, then garnish the entire bowl with freshly chopped parsley.