Preheat the oven to 400°F (200°C).
Place the chicken breasts on a baking sheet.
Arrange the cherry tomatoes, zucchini, and bell peppers around the chicken.
Drizzle the olive oil over the chicken and vegetables.
Sprinkle the Italian seasoning, garlic powder, salt, and pepper over the entire sheet pan.
Toss the vegetables lightly to coat them in the seasoning and oil.
Bake in the preheated oven for 25 minutes or until the chicken is cooked through and the vegetables are tender.
Remove from the oven and let rest for a few minutes before serving.