Preheat your oven to 375°F (190°C).
In a large mixing bowl, combine the cooked chicken, uncooked rice, chicken broth, cream of chicken soup, frozen mixed vegetables, diced onion, minced garlic, paprika, salt, pepper, and dried parsley. Mix well to ensure that all ingredients are evenly distributed.
Pour the mixture into the 9x13 inch baking dish and spread it out evenly.
Cover the dish with aluminum foil to prevent excess moisture loss during baking.
Bake in the preheated oven for 30 minutes.
After 30 minutes, remove the foil and stir the casserole gently. If desired, sprinkle shredded cheddar cheese on top for added flavor.
Return to the oven and bake for an additional 15 minutes, or until the cheese is melted and the rice is tender.
Allow to cool for a few minutes before serving. Enjoy your Chicken and Rice Casserole!