Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Halve the baby potatoes, slice the zucchini into rounds, and chop the red bell pepper into bite-sized pieces.
Mince the garlic clove finely.
In a large mixing bowl, combine the chicken breast, potatoes, zucchini, bell peppers, and cherry tomatoes.
Drizzle with olive oil and sprinkle with minced garlic, dried oregano, sea salt, and black pepper.
Toss everything thoroughly to ensure the chicken and vegetables are evenly coated in oil and spices.
Spread the mixture onto the prepared baking sheet in a single layer, ensuring the chicken is not covered by vegetables.
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 potatoes are tender.
Remove from the oven and drizzle the balsamic vinegar over the roasted chicken and vegetables before serving.