Preheat and prep: Heat the oven to 375°F (190°C). Lightly grease a 9x13-inch baking dish.
Sauté aromatics (optional but recommended): In a skillet, warm a bit of butter or oil and sauté the onion until soft, 3–4 minutes.
Add garlic for 30 seconds. This boosts flavor.
Mix the base: In a large bowl, whisk together the cream soup, chicken broth, milk, salt, pepper, paprika, and garlic powder until smooth.
Add rice and veggies: Stir the uncooked rice, sautéed onion/garlic, and frozen vegetables into the soup mixture.
Layer in the dish: Pour the mixture into the baking dish. Nestle the chicken pieces evenly on top and press them in slightly.
Sprinkle 1 cup of cheese over the surface.
Cover and bake: Tightly cover with foil and bake for 35 minutes. This traps steam so the rice cooks evenly.
Uncover, stir, and finish: Remove the foil, give everything a gentle stir, and check the liquid level. Bake uncovered for 10–15 more minutes, until the rice is tender and the chicken is cooked through.
Add final cheese: Sprinkle the remaining 1 cup cheese on top.
Bake 5 more minutes until melted and bubbly.
Rest and serve: Let the casserole rest for 5–10 minutes. Garnish with parsley or green onions and serve warm.