Preheat the oven to 375°F (190°C).
In a large baking dish, combine the rice, chicken broth, chopped onion, olive oil, frozen mixed vegetables, garlic powder, paprika, salt, and pepper.
Place the chicken on top of the rice mixture.
Cover with aluminum foil and bake for 45 minutes.
Remove the foil and bake for an additional 15 minutes, or until the chicken is cooked through and the rice is tender.
Let it rest for a few minutes before serving. Enjoy your hearty chicken and rice bake!