In a large baking dish, combine the diced chicken, rice, chicken broth, frozen vegetables, garlic powder, onion powder, salt, and pepper.
Stir everything together until well mixed.
Sprinkle the shredded cheese on top.
Cover with foil and bake for 30 minutes.
Remove the foil and bake for an additional 10-15 minutes, until the chicken is cooked through and the cheese is bubbly.