Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper for easy cleanup.
Pat the chicken breast dry with a paper towel to ensure the skin gets crispy, then cut it into bite-sized 1-inch pieces.
In a large mixing bowl, combine the chicken pieces, broccoli florets, sliced bell peppers, and zucchini.
Drizzle the olive oil and lemon juice over the mixture, then add the minced rosemary, thyme, garlic, sea salt, and black pepper.
Toss everything thoroughly until the chicken and vegetables are evenly coated in the oil and herbs.
Spread the mixture in a single layer on the prepared baking sheet, making sure not to overcrowd the pan so the vegetables roast rather than steam.
Roast for 18 to 22 minutes, or until the chicken is cooked through and the vegetables are tender with slightly charred, golden edges.
Remove from the oven and serve immediately, optionally finishing with a final squeeze of fresh lemon for extra brightness.