Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper for easy cleanup.
Cut the chicken breast into 1-inch bite-sized pieces and set aside.
Chop the broccoli, red bell pepper, zucchini, and sweet potato into uniform pieces to ensure they roast evenly.
In a small mixing bowl, whisk together the extra virgin olive oil, lemon juice, minced garlic, dried rosemary, dried thyme, sea salt, and black pepper.
Place the chicken pieces and all the chopped vegetables onto the prepared baking sheet.
Drizzle the lemon-herb oil mixture over the chicken and vegetables, then toss thoroughly with your hands or tongs until every piece is well coated.
Spread the mixture out into a single layer, ensuring the pan is not overcrowded so the ingredients roast rather than steam.
Roast in the center of the oven for 20 to 25 minutes, or until the chicken is cooked through and the vegetables are tender with slightly caramelized edges.
Remove from the oven and serve immediately, perhaps with an extra squeeze of fresh lemon for added brightness.