Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper to ensure even roasting and easy cleanup.
Cut the chicken breast into 1-inch bite-sized pieces and place them in a large mixing bowl along with the fresh broccoli florets.
In a small bowl, whisk together the extra virgin olive oil, lemon juice, minced garlic, dried oregano, sea salt, black pepper, and lemon zest until emulsified.
Pour the lemon-herb marinade over the chicken and broccoli, tossing thoroughly with your hands or a spatula to ensure every piece is well-coated.
Spread the mixture in a single layer on the prepared baking sheet, making sure not to overcrowd the pan so the ingredients roast instead of steam.
Roast for 18-22 minutes, or until the chicken is cooked through and the broccoli florets have developed slightly charred, crispy edges.
Remove from the oven and serve immediately while hot, finishing with an optional extra squeeze of fresh lemon for added brightness.