Preheat the oven to 350°F (175°C).
Mix ingredients: In a medium-sized bowl, combine the cooked chicken, onion soup mix, cream of mushroom soup, cream of chicken soup, milk, sour cream, water, minute rice, salt, and pepper. Stir until well blended.
Prepare the baking dish: Lightly grease a 9x13-inch baking pan with cooking spray.
Assemble the casserole: Pour the chicken and rice mixture into the prepared pan, spreading it evenly.
Bake covered: Cover the pan with aluminum foil and bake for 45 minutes.
Bake uncovered: Remove the foil and bake for an additional 15 minutes, allowing the top to brown slightly.
Serve: Remove from the oven and let it cool slightly before serving. Enjoy!
Notes
Use rotisserie chicken or any leftover cooked chicken for convenience.
Minute rice works best for this recipe. Avoid using uncooked long-grain rice, as it will need more liquid and a longer cook time.
Add extra flavor by mixing in shredded cheese or frozen veggies like peas or broccoli before baking.
Store leftovers in an airtight container in the refrigerator for up to 3 days.