Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper for easy cleanup.
Mince the garlic clove and finely chop the fresh thyme and rosemary leaves.
In a small mixing bowl, whisk together the extra virgin olive oil, fresh lemon juice, minced garlic, thyme, rosemary, sea salt, and black pepper to create the marinade.
Cut the chicken breast into 1-inch bite-sized cubes and chop the broccoli, bell pepper, and zucchini into uniform pieces.
Place the chicken and vegetables onto the prepared sheet pan and drizzle the lemon-herb marinade over the top, tossing thoroughly to ensure everything is well-coated.
Spread the mixture into a single, even layer to allow for proper roasting and a beautiful golden color.
Roast in the oven for 18-22 minutes, or until the chicken is cooked through and the vegetables are tender with slightly charred edges.
Remove from the oven and serve immediately, adding an optional extra squeeze of fresh lemon for a bright, zesty finish.