French Onion Chicken Casserole

This French Onion Chicken Casserole is an easy, comforting dish with tender chicken, rich onion flavor, and melted cheese—perfect for busy weeknights or potlucks.

This French onion chicken casserole is filled with creamy, cheesy chicken and topped with French fried onions, every mouthful is going to be better than the last. The creaminess of the filling and the crunchy texture of the fried onions on top really make this quite the treat for your tastebuds. Baked French onion chicken leaves nothing to be desired, you’ll be going back for seconds.

Why You’ll Love This Recipe

• This recipe only uses 7 ingredients! I know you’ve already got most of them in your pantry, too.
• There is not a lot of prep to do ahead of time for this simple casserole.
• Chicken and French fried onion casserole will be on the table in under an hour.

Ingredients for French Onion Chicken Casserole

• Cooked chicken – Shredded chicken will mix into the casserole best. This is a great way to use any leftover chicken breast. It is also handy to use a rotisserie chicken here.
• French style green beans – Drain the beans so the casserole doesn’t turn out watery. You can also use frozen green beans as a substitute.
• Cheddar cheese – Buy a block and shred it yourself for the best flavor and meltability.
• Sour cream – Use full fat for the best flavor. You can substitute plain Greek yogurt if you need to.
• Mayonnaise – Adds flavor and creaminess to the French onion chicken casserole.
• Cream of chicken soup – A can of soup really adds to the creaminess of this dish. If you’ve already got cream of mushroom or celery on hand, you can use those too.
• French fried onions – Add delicious flavor and crunchy texture to this dish.

How To Make French Onion Chicken Casserole

In a large mixing bowl, add the drained green beans, shredded cheddar cheese, sour cream, mayonnaise and cream of chicken soup. Stir until combined.

Add the shredded chicken and stir until combined.

Spoon mixture into greased baking dish.

Bake in preheated oven at 350 degrees Fahrenheit uncovered for 30 minutes.

Sprinkle the fried onions on top and cook for another 5 minutes.

Let stand for 5-10 minutes before serving.

Storage and Reheating

Fridge: Store leftover casserole in an airtight container up to 3 days.

Freezer: Freeze French onion chicken casserole in an airtight container. Thaw in the fridge overnight before heating. Texture may change after being frozen and thawed.

To reheat leftovers, heat in the oven at 350 degrees Fahrenheit for about 10 minutes, or until hot throughout. You can also microwave individual portions for convenience or us the stovetop.

Can I Make This Dish In Advance?

You can make this dish a day in advance and store it covered in the fridge. When you are ready to cook it, I recommend removing it from the fridge while the oven preheats so the dish can come closer to room temperature. If it is still very cold when you place it in the oven, you might need a longer cook time. Do not add the fried onions until the last five minutes of baking.

Creamy French onion chicken casserole is a comfort dish you’ll make all year long. This hearty dish is a crowd pleaser so double up the recipe if you’re hoping for leftovers.

How To Serve French Onion Chicken Casserole

French onion chicken casserole is filling on it’s own but if you want to add any more items to the menu for tonight, I suggest crispy and garlicky Smashed Potatoes and easy Glazed Carrots.

This is also a good way to use up any leftover rice or Buttered Noodles, just to add a little something to everyone’s plate.

When most of the meal is made in one dish, it just feels like it’s easier to whip up a dessert too! Soft, chewy Monster Cookie Bars are a big hit around here!

More Great Chicken Casserole Recipes

• Switch up a classic comfort food and make it a casserole! Chicken Pot Pie Casserole is creamy, full of veggies and has the flakiest top.
• Hashbrowns, cheese and chicken? Yes, please! Super creamy Cheesy Hash Brown Chicken Casserole is not one to miss.
• One-pan Italian Cheesy Chicken and Rice is definitely one to add to your regular rotation. This casserole is family friendly and seasoned to perfection.
• When fajitas seem like they might be too much work, throw together a Chicken Fajita Casserole instead! Creamy, cheesy and filled with red peppers, chicken and rice, this is a hearty meal everyone will love.