Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.
In a small saucepan, combine the dry white rice with 0.5 cups of water, bring to a boil, then reduce heat to low and simmer covered for 15 minutes.
Pat the chicken breast dry with a paper towel and rub with half of the olive oil, dried oregano, garlic powder, sea salt, and black pepper.
Place the seasoned chicken breast on the prepared baking sheet and roast in the oven for 20 to 25 minutes until the internal temperature reaches 165°F.
Toss the broccoli florets with the remaining olive oil and a pinch of salt, then add them to the baking sheet for the final 10 to 12 minutes of roasting.
Once cooked, remove the chicken from the oven and drizzle with fresh lemon juice and sprinkle with lemon zest.
Fluff the cooked rice with a fork and serve the roasted chicken and broccoli directly over the top.