Preheat your oven to 400°F and line a large sheet pan with parchment paper for easy cleanup.
Chop the zucchini, red bell pepper, and red onion into bite-sized pieces, and mince the garlic clove.
Place the chicken breast, zucchini, bell pepper, onion, and cherry tomatoes on the prepared sheet pan.
Drizzle with extra virgin olive oil and lemon juice, then sprinkle with the minced garlic, dried oregano, sea salt, and black pepper.
Toss the vegetables and coat the chicken thoroughly with the oil and seasonings using your hands or tongs.
Roast for 20-25 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are tender.
Let the chicken rest for 5 minutes before slicing to keep it juicy, then serve immediately with the roasted vegetables.