French Onion Chicken Casserole

If you are like me, sometimes you need a quick fix on a weeknight. This French Onion Chicken Casserole is simple and fast.

wooden spoon scooping out french onion chicken casserole with text overlay for facebook


I associate the sound of that can popping with warm memories of childhood honey and biscuits. While I still love them (especially with Cranberry Syrup), I have also found ways to use them in my savory dishes, especially quick weeknight meals.

Those buttery layers are just so versatile! Now I am craving biscuits…

Why You’ll Love This Dinner

This time of year I crave warm comfort food and nothing says comfort more than a bowl of French Onion Soup, but on busy weeknights, I just don’t have the time.

So, I converted my favorite cheesy soup into a soul-warming casserole: French Onion Chicken Casserole. See where this is going?

To save on time, I used store-bought rotisserie chicken and caramelized onions I had frozen the month before blended with sour cream, beef bullion, mayonnaise, and cream.

To top off my French Onion Chicken Casserole, I used traditional Swiss cheese slices and buttery biscuits. All the ingredients in one bite make a blissful and satisfying one-dish meal with little cleanup.

So POP a can of your own and make French Onion Chicken Casserole for dinner tonight! Your family will LOVE it. I promise!

overhead shot of pan of french onion chicken casserole


  • Chicken – You want this to be shredded or cubed. My favorite way to save time is to use a store bought rotisserie chicken. However you can cook some juicy chicken breasts in a large skillet yourself too.
  • Mayonnaise – Although creamy, mayonnaise is really just oil and egg. So on top of adding a little flavor, it also helps to bind everything together.
  • Sour cream – This adds to the creaminess and substance to the casserole. You could also use plain greek yogurt instead.
  • Heavy cream – This helps to thin everything out while also keeping this creamy chicken casserole just that, creamy.
  • Beef bouillon granules – To achieve granules, simply grind them with a mortar and pestle or the back of a spoon.

  • Salt and pepper – I always prefer to use fine sea salt and freshly ground pepper when cooking.
  • Rubbed sage – If you don’t have sage on hand, feel free to sub rosemary or thyme instead.
  • Caramelized onions – Yes, there is a difference between sautéed onions and caramelized onions. Click over to find out the difference!
  • French cut green beans – I suppose you could use regular green beans for this french onion chicken bake, but in sticking with the french theme, this is what I used.
  • Swiss cheese – I prefer Swiss cheese as it gets all melty and delicious, but see the variations selection below for other cheese options.
  • Grands biscuits – Simple ingredients is what makes this one of my favorite recipes. And ready made biscuit cut into quarters is an easy way to simplify this meal.
serving of french onion chicken casserole

How to Make French Onion Chicken Casserole

  1. Prepare oven and baking dish. Coat a casserole dish with cooking spray and preheat oven.
  2. Combine filling ingredients. In a large mixing bowl, combine chicken through rubbed sage. Mix well.
  3. Add green beans and onions. Fold in French cut greens beans and caramelized onions. Spread mixture evenly into your dish.
  4. Bake. Bake for an initial 30 minutes to warm the filling.
  5. Add cheese and biscuits. Remove and layer Swiss cheese over hot chicken mixture. Evenly distribute Grands biscuits quarters and return to oven for 10 minutes, or until tops are lightly browned.
  6. Serve. Remove from oven, serve onto plates and top with fresh chopped parsley.
collage of how to make french onion chicken casserole


  • Cream of chicken soup – A lot of delicious casserole recipes use a can of cream of chicken soup as the base. While it won’t be as creamy, you can certainly use that in place of the sour cream.
  • Cheese – Instead of Swiss, try adding your favorite cheese instead. Some great options would be parmesan cheese, mozzarella cheese, gruyere cheese or even provolone cheese. The glorious melted cheese might be my favorite part!
  • Veggies – If you don’t have a picky eater in the family and would like to add more veggies, yellow onions, broccoli or even those delicious french fried onions would be a great addition to this easy french onion chicken casserole.
overhead shot of serving of french onion chicken casserole on plate

What to Serve with French Onion Casserole

This casserole is great with just about any side dish, but we love it with some veggies since it doesn’t have a ton in it. Here are our favorites.

overhead shot of baking dish of french onion chicken casserole

Storage and Freezing

This casserole makes great leftovers! You can store this french onion chicken casserole in an airtight container in the refrigerator for up to five days.

And if you have leftovers and need to freeze them, check out my tips for how to freeze a casserole!

collage of french onion chicken casserole for pinterest

More Easy Weeknight Dinners

We love easy dinner recipes and casserole recipes, so here are a few more.

marry me chicken on a spoon

Marry Me Chicken

4.84 from 53 votes
Juicy chicken breasts in a creamy sauce and ready in under an hour, this Marry Me Chicken recipe is the perfect weeknight meal!
See The Recipe!
plate of chicken casserole topped with avocado and sour cream

Creamy Mexican Chicken Casserole

4.86 from 14 votes
This easy, creamy Mexican Chicken Casserole combines tender chicken, vegetables, and beans with lots of cheese for the ultimate easy dinner!
See The Recipe!
wooden spoon digging into casserole

Stuffed Pepper Casserole

5 from 7 votes
If you're craving traditional stuffed peppers but don't want to put in the work, try this quick and EASY Stuffed Pepper Casserole recipe!
See The Recipe!
baking dish of french onion chicken casserole with text overlay for pinterest
serving of french onion chicken casserole

French Onion Chicken Casserole Recipe

4.43 from 61 votes
French Onion Chicken Casserole is a one-dish meal that blends chicken, green beans, a creamy sauce, and buttery biscuits. It’s 100% delicious!
Prep Time: 5 minutes
Cook Time: 45 minutes
Total Time: 50 minutes
Servings: 6



  • Coat a 9×13 baking dish with cooking spray. Preheat the oven to 350°F.
  • In a large mixing bowl, combine the chicken, mayonnaise, sour cream, heavy cream, bouillon, salt and pepper and sage.
  • Fold in the French cut greens beans and caramelized onions. Spread the mixture evenly into your dish.
  • Bake for 30 minutes. Remove and layer Swiss cheese over the hot chicken mixture. Evenly distribute the biscuit quarters and return to oven for 10 minutes, or until tops are lightly browned.
  • Allow to rest for 5-10 minutes before serving.
  • If you've tried this recipe, come back and let me know how it was in the comments or star ratings.



If you have beef bouillon cubes, grind them with a mortar and pestle or the back of a spoon.


Calories: 533 kcal, Carbohydrates: 9 g, Protein: 31 g, Fat: 40 g, Saturated Fat: 14 g, Cholesterol: 123 mg, Sodium: 702 mg, Potassium: 345 mg, Fiber: 1 g, Sugar: 3 g, Vitamin A: 655 IU, Vitamin C: 5.1 mg, Calcium: 268 mg, Iron: 1.7 mg
Author: Jessica Formicola
Calories: 533
Course: Main Course, Main Dish
Cuisine: American
Keyword: chicken casserole, french onion chicken
Did you make this recipe?I’d love to see your recipes – snap a picture and mention @savoryexperiments or tag #savoryexperiments!
Jessica Formicola in her ktichen

About the Author

Jessica Formicola

Jessica the mom, wife and chef behind Savory Experiments. You might see her on the Emmy- nominated TV show Plate It! or on bookshelves as a cookbook author. Jessica is a Le Cordon Bleu certified recipe developer and regularly contributed to Parade, Better Homes & Gardens, The Daily Meal and more!

Read More About Jessica

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Recipe Rating

Questions and Reviews

  1. 4 stars
    Such a good recipe but holy cow it was SALTYYY! Like overwhelmingly salty. I would leave out the teaspoon of salt and maybe a bit of the bouillon next time. Definitely making this again but with some small changes