Preheat your oven to 425°F (220°C) and line a large sheet pan with parchment paper for easy cleanup.
In a small bowl, whisk together balsamic vinegar, olive oil, honey, minced garlic, dried oregano, salt, and pepper until well combined.
Place the chicken breasts in a large mixing bowl and pour half of the balsamic mixture over the chicken. Make sure each piece is well coated. Let it marinate for at least 15 minutes for enhanced flavor.
While the chicken is marinating, toss the cherry tomatoes, red onion, and zucchini in the remaining balsamic mixture in a separate bowl. Mix until vegetables are coated evenly.
Take the marinated chicken and arrange it on one side of the prepared sheet pan. On the other side, spread the seasoned vegetables evenly.
Place the sheet pan in the preheated oven and bake for 25-30 minutes, or until the chicken reaches an internal temperature of 165°F (75°C) and the vegetables are tender.
Once cooked, remove from the oven and let it rest for a few minutes before slicing the chicken.
Serve the chicken and vegetables on a plate, drizzled with the pan juices and garnish with fresh basil leaves.
Notes
Let the chicken marinate for at least 15 minutes for enhanced flavor.