This is my French Onion Soup Chicken Casserole and it's perfect for when you're craving something comforting and cosy. Having lived in France when I was younger, this is such a nostalgic dish for me. With a caramelised onion, white wine, and beef stock stew, we then add chicken and top with sliced baguette and gruyère. I really hope you enjoy it!
This chicken casserole French onion soup recipe is such a crowd-pleaser and really simple to make. I tend to serve it up how it is, but you could also serve it with mashed potato, pasta, or beans.
A casserole is always such a nostalgic dish for me, so if you're looking for more hearty recipes, then check out my butter bean soup recipe, cowboy casserole, baked chicken with cream of chicken soup, or my baked ziti with ground turkey recipe.
For those of you looking for some thanksgiving or Christmas lunch inspiration, my stuffing stuffed chicken breast recipe or creamy mushroom vegan stroganoff are such winners!
Jump to:
Why you'll love this recipe
Hearty: French onion soup has to be one of the best soups in the world for cosy season, as does chicken casserole. So, the two combined makes a very special wholesome dish. Speaking of hearty dishes, if you're looking for some more inspiration, my deconstructed ravioli soup and my roasted red pepper and Gouda Soup are two great options!
Simple: Despite the fancy undertones of this dish, it's actually very simple. You just need onions, garlic, a couple of stock pots, chicken, bread, and some cheese, and you're ready to go! The methods are also very easy and everything is made is one pan!
Prep in advance: chicken casserole French onion soup style is a great dish to prepare in advance if you're having guests over. Just store it in the fridge (without the bread or cheese on top), and then when you're ready to enjoy dinner, place it back onto the stovetop to heat it up, then add on the bread and cheese, under the grill, and voila!
Ingredients & Substitutions
Olive oil: Provides a lovely depth of flavour and pepperiness. If you don't have olive oil, just use any vegetable oil.
Butter: Salted butter to add creaminess and flavour.
White onions: You'll want a handful of white onions. Red onions could also work if they're the only option you have. The taste will differ slightly.
Garlic: Whole cloves of garlic, finely minced. I wouldn't recommend using garlic powder or granules just because you want that fresh flavour. But if the granules are all you have, then add in ½ tsp.
Flour: All-purpose flour helps thicken the casserole sauce slightly. You could use cornflour as a gluten free option.
Chicken: I used chicken breasts. You could also use chicken thighs. For those not wanting to eat meat, torn tofu would work well in this.
Stock: Beef stock and a white wine stock are needed. Or you could just use ½ glass white wine. Use veggie stock for a veggie version and add in a splash of red wine.
Baguette: a French baguette sliced into 1 inch slices.
Gruyère cheese: A gorgeous cheese that is used in French onion soup. If you don't have access to this cheese, you could use cheddar or gouda, the flavour will differ.
Chives: For garnish! You could also use parsley.
Step by step instructions with photos
Step 1: Place a casserole dish on medium heat and add in your olive oil followed by the butter. Once melted, add in your sliced onion and fry for 15 minutes, stirring frequently.
Step 2: Once the onions have caramelised slightly, add in your garlic and sugar. Fry for another few minutes.
Step 3: Add in your sliced chicken breast and fry for 5 minutes, season with a sprinkling of salt and grinding of pepper.
Step 4: Pour in your flour followed by the beef and white wine stock, followed by your water. Give everything a good mix until combined and then simmer for another 10 minutes until the sauce has thickened and the chicken is cooked.
Step 5: Once the French onion soup chicken casserole stew is viscous and the chicken is cooked through, give it a taste and season accordingly.
Step 6: Top the chicken casserole with sliced baguette and then top with grated gruyère cheese. Place under the grill for a few minutes until the cheese is melted and golden.
Step 7: Remove the chicken casserole French onion soup dish from the grill and top with chopped chives. Enjoy!
What to do with leftovers
Storage: Place any leftover French onion chicken casserole in airtight containers once cooled and into the fridge for up to 3 days.
Freezing: To freeze, once again, leave the dish to cool then place it into airtight containers. Don't forget to label the containers. Place into the freezer for up to 3 months. When you're ready to eat it, leave to thaw in the fridge overnight and then follow the reheating instructions below.
Reheating: Leave the container lid slightly ajar and place in the microwave and heat until piping hot. You could alternatively place any casserole leftovers (minus the bread) in a pan and place on medium heat with a splash of water. Heat until simmering, then enjoy with fresh baguette. If you want to reheat your baguette slices, then place them under the grill for a few minutes to heat and crisp up.
French onion soup chicken casserole FAQs
Adding beef stock and or white wine stock creates a gorgeous depth of flavour. Also, caramelising the onions brings out a lovely flavour that adds to the dish too.
If you don't have gruyère, you could use gouda or cheddar. The flavour won't be the same but it'll still give you a cheesiness.
You could serve mashed potatoes or pasta alongside this French onion chicken casserole. You could also serve some green beans, steamed broccoli, or a side French salad.
More recipes you might enjoy!
If you tried this French Onion Soup Chicken Casserole recipe or any other recipe on my website, please leave a 🌟 star rating and let me know how it went in the 📝 comments below. Thank you!
French Onion Soup Chicken Casserole
Ingredients
- 1 tablespoon olive oil
- 2 tablespoon salted butter
- 4 white onions finely sliced
- ½ teaspoon sugar
- 4 garlic cloves minced
- 2 chicken breasts sliced into small pieces
- 2 tablespoon all-purpose flour
- 500ml beef stock
- 200ml white wine stock or 150ml white wine
- 1 small baguette sliced into 8, 1 inch pieces
- 80g gruyère cheese grated
- 10g chives finely sliced
Instructions
- Place a casserole dish on medium heat and add in your olive oil followed by the butter. Once melted, add in your sliced onion and fry for 15 minutes, stirring frequently.
- Once the onions have caramelised slightly, add in your garlic and sugar. Fry for a few more minutes.
- Add in your sliced chicken breast and fry for 5 minutes, season with a sprinkling of salt and grinding of pepper.
- Pour in your flour followed by the beef and white wine stock. Give everything a good mix until combined and then simmer for another 10 minutes until the sauce has thickened and the chicken is cooked.
- Once the French onion soup chicken casserole stew is viscous and the chicken is cooked through, give it a taste and season accordingly. Feel free to see the step by step images further up this blog for reference!
- Top the chicken casserole with sliced baguette and then sprinkle with grated gruyère cheese. Place under the grill for a few minutes until the cheese is melted and golden.
- Remove the chicken casserole French onion soup dish from the grill and top with chopped chives. Enjoy!
Leave a Reply