Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Cut the chicken breast into 1-inch bite-sized cubes and place them in a large mixing bowl.
Chop the bell pepper, zucchini, and broccoli into uniform pieces and add them to the bowl with the chicken.
Mince the garlic cloves and finely chop the fresh rosemary and thyme leaves.
Drizzle the olive oil over the chicken and vegetables, then sprinkle with the minced garlic, chopped herbs, sea salt, and black pepper.
Toss everything together until the chicken and vegetables are thoroughly and evenly coated with the oil and seasonings.
Spread the mixture in a single layer on the prepared baking sheet, ensuring space between pieces for even roasting.
Squeeze the juice from the half lemon over the entire tray and place the squeezed lemon rind on the sheet for extra fragrance.
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 charred edges.