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French Onion Chicken Casserole

by Christina Cherrier – Mar 28, 2021
Meal planner
French Onion Chicken Casserole
French Onion Chicken Casserole - #chicken #recipe #eatwell101 - This chicken casserole makes a delicious and satisfying everyday meal for busy families. #keto #lowcarb
French Onion Chicken Casserole - #chicken #recipe #eatwell101 - This chicken casserole makes a delicious and satisfying everyday meal for busy families. #keto #lowcarb

French Onion Chicken Casserole – This French onion chicken casserole makes a delicious and satisfying everyday meal for busy families. Juicy, succulent chicken breasts are topped with caramelized onions and glorious melted cheese. Serve with steamed vegetables or a light salad, and this well-seasoned chicken casserole recipe is a big family favorite! This easy go-to meal is also Low Carb and Keto-friendly. Enjoy!

french onion chicken casserole recipePhoto credit: ©

Ingredients list for the French Onion Chicken Casserole

chicken cheese casserole 2Photo credit: ©

French Onion Chicken Casserole Recipe 3Photo credit: ©

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chicken cheese casserolePhoto credit: ©

keto chicken casserolePhoto credit: ©

low carb chicken casserolePhoto credit: ©

French Onion Chicken Casserole Recipe 2Photo credit: ©

keto chicken casserole recipePhoto credit: ©


1. To make the French onion chicken casserole: Preheat your oven to 400°F (200°C). Lightly grease a 9×12-inch baking dish and set aside.

2. Melt butter in a large skillet over medium-high heat. Add onions and season with salt and pepper. Cook for 5-8 minutes until soft.

3. Reduce heat to medium and cook, stirring occasionally, until onions are caramelized – about 15 minutes. Pour in 1/4 cup of broth to deglaze if your pan gets too dry, and keep stirring until onions are browned. 

4. Stir in fresh minced garlic and cook until fragrant, about 1 minute. Turn off the heat and allow to cool slightly.

5. Season chicken breasts with oregano, crushed chili pepper flakes, salt, pepper, and garlic powder. Go easy on the salt because French onion and cheese are already salted. Arrange chicken breasts in the baking dish. 

6. Divide caramelized onions on top of each chicken breast. Sprinkle shredded cheese on top and bake for 20-25 minutes in the oven (or more, depending on the thickness of your chicken breasts), until fully cooked and cheese is bubbly. Then broil for 2 minutes to crisp up the cheese. Garnish the French onion chicken casserole with fresh chopped parsley and serve immediately with steamed vegetables or cauliflower rice. Enjoy!

Tips for the French Onion Chicken Casserole:

  • You can prepare the caramelized onion ahead of time, and just assemble the chicken casserole at the last minute before baking.
  • You can flavor up the french onion with a dash of white wine, sherry or balsamic vinegar to deglaze the pan.
  • The cooking time will depend on the thickness of your chicken breasts. Cut them horizontally if they are too thick. You can also pound the chicken breasts (gently!) to get them to an even thickness.
  • Go easy on the salt because French onion and cheese are already salt. The taste of the French onion chicken casserole would be overpowered by saltiness.

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  • Jeanne

    2021-07-13 02:02:20

    Very good and easy. But my onions took MUCH longer to cook down, and I had an 11 inch skillet. But the flavor was delicious-I did use Swiss cheese instead. I will make it again, for sure!

  • Sharmon

    2021-05-16 19:26:37

    Way to much caramelized onion! Over powering!

  • Angie

    2021-05-12 15:18:57

    This was easy to make and tasty, but net time I will add the cheese only in the last 15 minutes. It was all hard and crispy, too much. I carmelized the onions all day in the crock pot and that made things easier. I will make again, with small changes.

  • Bonnie

    2021-02-23 07:27:58

    This was delicious. I ended up using a mix of Fontina and Gruyere cheese I had left in the the fridge. The onions are a labor of love - make ahead of time if you can.

  • Lisa

    2021-02-01 21:19:53

    Although I will definitely caramelize the onions ahead of time, it was delicious. We had this with fresh steamed broccoli and could not have enjoyed it more. Definitely a keeper

  • Dylan

    2021-02-01 20:12:58

    Delicious! I accidentally made this with 4 chicken thighs instead of 3 breasts, and used one large onion, but it turned out perfect. New family favorite.

  • Jasmine

    2021-01-19 23:46:16

    Great recipe! However, caramelizing the onions took much longer than recipe states. Nonetheless, this is DELICIOUS!

  • Heather

    2020-11-12 18:29:39

    Just happened to stumble across this recipe and omg am I so glad I did!!! Absolutely amazing. Best chicken I’ve had in a long time and the recipe was delicious!!!

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