Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
In a small mixing bowl, whisk together 0.5 tbsp of the olive oil, lemon juice, lemon zest, dried oregano, sea salt, and black pepper to create the marinade.
Place the chicken breast on one side of the prepared baking sheet and brush both sides generously with the lemon-herb marinade.
On the other side of the baking sheet, toss the broccoli florets, chopped red bell pepper, and sliced zucchini with the remaining 0.25 tbsp of olive oil and a pinch of salt.
Roast in the oven for 20-25 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are tender and slightly charred.
Remove from the oven and let the chicken rest for 5 minutes before slicing.
Serve the sliced chicken and roasted vegetables over a bed of warm, fluffy cooked quinoa.