Preheat your oven to 400°F (200°C) and line a large rimmed sheet pan with parchment paper for easy cleanup.
Cut the chicken breast into 1-inch bite-sized cubes and place them in a large mixing bowl.
Prepare the vegetables by chopping the broccoli into small florets, slicing the bell pepper into strips, and dicing the zucchini into half-moons.
Add all the prepared vegetables to the bowl with the chicken.
In a small ramekin, whisk together the extra virgin olive oil, lemon juice, minced garlic, dried oregano, dried thyme, sea salt, and black pepper.
Drizzle the lemon-herb dressing over the chicken and vegetables, tossing thoroughly with your hands or a spatula to ensure every piece is well-coated.
Spread the mixture in a single, even layer onto the prepared sheet pan, making sure not to overcrowd the pan so the vegetables roast rather than steam.
Roast in the center of the oven for 18 to 22 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are tender and slightly browned.
Remove from the oven and let rest for 2 minutes before serving hot.