Preheat your oven to 400°F (200°C) and line a large rimmed sheet pan with parchment paper.
Cut the chicken breast, red bell pepper, and zucchini into uniform 1-inch pieces and break the broccoli into small florets.
In a small mixing bowl, whisk together the olive oil, minced garlic, lemon juice, dried oregano, dried thyme, sea salt, and black pepper.
Place the chicken and all the vegetables onto the prepared sheet pan.
Pour the lemon herb dressing over the ingredients and toss thoroughly with your hands or tongs to ensure everything is evenly coated.
Spread the mixture out into a single layer, ensuring the chicken and vegetables aren't overcrowded to allow for proper browning.
Roast in the center of the oven for 20 to 25 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are tender with slightly charred edges.
Remove from the oven and let rest for 2 minutes before serving to allow the juices to redistribute.