Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper for easy cleanup.
Slice the zucchini into half-moons, chop the red bell pepper into bite-sized pieces, and thinly wedge the red onion.
In a small bowl, whisk together the extra virgin olive oil, minced garlic, dried oregano, dried thyme, sea salt, black pepper, and fresh lemon juice.
Place the chicken breast and the chopped vegetables onto the prepared sheet pan.
Pour the herb marinade over the chicken and vegetables, tossing thoroughly with your hands or tongs to ensure every piece is well-coated.
Spread the ingredients into a single layer, ensuring the chicken is not covered by the vegetables to allow for even browning.
Roast in the center of the oven for 20-25 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are tender and slightly caramelized.
Let the chicken rest for 5 minutes before slicing to keep it juicy, then serve alongside the roasted vegetables.