In a large bowl, combine chicken, broccoli, and bell peppers.
Drizzle the olive oil and balsamic vinegar over the ingredients, then sprinkle with garlic powder, salt, and pepper. Toss everything together until well coated.
Transfer the mixture to a baking sheet and spread it out in a single layer.
Bake for 30 minutes, or until the chicken is cooked through and vegetables are tender.
Remove from the oven and let it rest for a few minutes before serving.
Notes
This dish is perfect for quick weeknight dinners and can be served with rice or quinoa.