Preheat your oven to 400°F and line a large rimmed sheet pan with parchment paper to ensure easy cleanup and prevent sticking.
Dice the chicken breast into uniform 1-inch pieces and chop the broccoli, bell pepper, and zucchini into similar sizes for even roasting.
In a small glass bowl, whisk together the extra virgin olive oil, fresh lemon juice, minced garlic, dried oregano, dried thyme, sea salt, and black pepper.
Arrange the chicken and vegetables on the prepared sheet pan, pour the lemon-herb marinade over them, and toss thoroughly with your hands or tongs.
Spread the ingredients out into a single, even layer, making sure not to overcrowd the pan so the vegetables roast beautifully instead of steaming.
Roast in the center of the oven for 18 to 22 minutes, or until the chicken is cooked through and the vegetables are tender with slightly caramelized edges.