Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Cut the chicken breast into 1-inch bite-sized pieces and place them in a large mixing bowl with the broccoli florets.
In a small jar, whisk together the olive oil, lemon juice, lemon zest, minced garlic, oregano, thyme, salt, and pepper.
Pour the lemon-herb marinade over the chicken and broccoli, tossing thoroughly to ensure every piece is well-coated.
Spread the mixture in a single layer on the prepared baking sheet, ensuring space between pieces for optimal browning.
Roast for 18-20 minutes until the chicken is cooked through and the broccoli edges are golden and crisp.
Remove from the oven, sprinkle immediately with the parmesan cheese, and serve warm.