Creamy, cheesy, savory, and oh-so-satisfying — this French Onion Chicken Rice Casserole is a cozy family favorite. Whether you’re feeding a crowd or looking for an easy make-ahead dinner, this dish is packed with flavor and comfort in every bite.
If you’re a fan of French onion soup and cheesy chicken casseroles, this recipe is your dream come true. It’s the perfect blend of rich, creamy textures and deep, savory flavor — thanks to the French onion soup mix and a duo of melty cheeses. It’s one of those meals that’s easy enough for busy weeknights but tasty enough to serve at casual gatherings.
This casserole is:
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✔️ Quick to assemble
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✔️ Family-friendly
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✔️ Comforting and hearty
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✔️ Easily customizable
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✔️ Great for leftovers
Ingredients You’ll Need
Here’s everything you’ll need to make this warm and satisfying casserole:
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2 cups shredded cooked chicken – Rotisserie chicken works beautifully here.
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2 cups cooked white rice – Leftover rice is perfect for this recipe.
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1 can (10.5 oz) cream of chicken soup – Adds rich creaminess.
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1 cup sour cream – For that tangy, creamy layer.
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1 packet (1 oz) French onion soup mix – The secret to all the oniony flavor.
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1 cup shredded mozzarella cheese – For stretch and melt.
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1 cup shredded cheddar cheese – For sharp, cheesy depth.
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1 tablespoon butter (optional) – For greasing your baking dish.
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Optional topping: crispy fried onions or extra shredded cheese – Adds a golden, crunchy finish.
How to Make French Onion Chicken Rice Casserole
This casserole comes together quickly in just a few easy steps:
Step 1: Preheat and Prep
Preheat your oven to 350°F (175°C). Lightly grease a 9×13-inch baking dish with butter or cooking spray. This helps prevent sticking and makes cleanup easier.
Step 2: Mix the Filling
In a large mixing bowl, stir together the shredded chicken, cooked rice, cream of chicken soup, sour cream, and French onion soup mix. Mix until everything is evenly combined.
Step 3: Add the Cheese
Fold in both the shredded mozzarella and cheddar cheese. Mix until the cheeses are fully incorporated into the mixture. It will be thick, creamy, and full of flavor!
Step 4: Assemble the Casserole
Spoon the mixture into your prepared baking dish and spread it out evenly with a spatula.
Step 5: Add Toppings
Sprinkle extra shredded cheese or crispy fried onions over the top. This step is optional, but it adds a golden, melty or crunchy finish that really takes it over the top.
Step 6: Bake
Place the dish in the oven and bake uncovered for 25–30 minutes, or until the casserole is heated through and bubbling at the edges.
Step 7: Rest and Serve
Let the casserole rest for 5–10 minutes before serving. This helps it set slightly and makes it easier to slice and serve.
Serving Suggestions
This casserole is hearty on its own but pairs beautifully with:
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A crisp green salad with a tangy vinaigrette
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Steamed or roasted vegetables (think broccoli, carrots, or green beans)
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Garlic bread or dinner rolls to soak up every bit of cheesy goodness
Make It Ahead
This dish is a great make-ahead option! You can assemble it up to 24 hours in advance, cover tightly, and refrigerate. When ready to bake, let it sit at room temperature for 20 minutes and then bake as directed.
You can also freeze it (before or after baking). Wrap tightly in foil and freeze for up to 2 months. Thaw in the refrigerator overnight and reheat in the oven at 350°F until warmed through.
Variations & Add-Ins
Want to mix things up? Try these delicious twists:
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Use brown rice or wild rice for extra texture and nuttiness.
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Swap cream of chicken soup with cream of mushroom or cream of celery for a different base flavor.
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Add veggies like sautéed mushrooms, peas, or steamed broccoli to make it more colorful and nutritious.
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Use Swiss or Gruyère cheese in place of cheddar for a more traditional French onion vibe.
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Top with crushed Ritz crackers or panko breadcrumbs mixed with melted butter for a golden, crispy crust.
Leftovers & Storage
Refrigerator: Store leftovers in an airtight container in the fridge for up to 4 days.
Freezer: Freeze individual portions in containers or wrap tightly in foil. Freeze for up to 2 months.
Reheat: Reheat in the microwave or in a 350°F oven until heated through.
Final Thoughts
This French Onion Chicken Rice Casserole is everything you want in a comforting meal—easy to make, incredibly flavorful, and always a crowd-pleaser. It’s perfect for busy weeknights, Sunday dinners, potlucks, or just when you’re craving something cozy and satisfying.
Let me know in the comments if you try it! And if you’re a casserole lover, this one’s sure to earn a permanent spot in your dinner rotation. 🧅🍗🍚
