Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper for easy cleanup.
Cut the chicken breast into 1-inch bite-sized pieces and chop the broccoli, bell pepper, and zucchini into uniform chunks.
Finely mince the garlic cloves.
In a large mixing bowl, combine the chicken, vegetables, and minced garlic with the olive oil, dried oregano, dried thyme, sea salt, and black pepper.
Toss everything thoroughly until the chicken and vegetables are evenly coated in the oil and seasonings.
Spread the mixture in a single layer across the prepared baking sheet, ensuring the pieces are not overcrowded to allow for roasting rather than steaming.
Roast in the oven for 18 to 22 minutes, or until the chicken is cooked through and the vegetables are tender with slightly charred edges.
Remove from the oven and drizzle the fresh lemon juice over the hot chicken and vegetables before serving.