If you’re searching for a cozy, comforting dish to warm you on a chilly evening, look no further than this French Onion Chicken Casserole. Packed with savory flavors and creamy textures, this casserole is a delightful twist on classic French onion soup, combined with tender chicken and nutritious broccoli, all topped with crunchy French fried onions. It’s easy to prepare, making it perfect for busy weeknights or a relaxed weekend dinner. Let’s dive into how to create this heartwarming dish that’s sure to become a family favorite!
Why This Recipe Works

This French Onion Chicken Casserole is the ultimate comfort food that combines several comforting elements into one delicious dish. The use of condensed cream of chicken soup creates a creamy base that perfectly complements the rich flavors of the onion soup mix. The addition of sour cream adds a tangy depth while the broccoli provides a nice crunch and nutritional boost. Topping it all with crispy French fried onions ensures that every bite is filled with texture and flavor. This dish is not only easy to prepare but is also versatile, allowing for various substitutions based on what you have on hand.
What We’re Using
- 10.5-ounce can condensed cream of chicken soup: This forms the creamy base of the casserole.
- 1 cup sour cream: Adds a tangy richness; avoid using lite sour cream for the best texture.
- 1 packet dry Lipton Onion Recipe Soup and Dip Mix: This gives the casserole its signature French onion flavor. You can also use Knorr French Onion Recipe Mix.
- 1 teaspoon garlic powder: Enhances the flavor; adjust to your taste.
- 2 teaspoons salt: Use according to your preference and dietary needs.
- 1 teaspoon freshly ground black pepper: Adds a gentle kick; adjust to personal taste.
- 4 cups shredded cooked chicken: For convenience, leftover chicken from a whole roasted chicken or store-bought rotisserie chicken works great.
- 2 cups broccoli florets: Fresh broccoli provides more crunch, while thawed frozen broccoli offers softer texture.
- 1 cup shredded cheddar cheese: Melts beautifully and adds richness.
- 1 cup crispy French fried onions: For that irresistible crunch on top!
Essential Tools for Success
- Large mixing bowl: For combining all your ingredients.
- 9×13 inch baking dish: Ideal for casserole preparation and baking.
- Measuring cups and spoons: To ensure precise measurements.
- Spatula or wooden spoon: For mixing ingredients thoroughly.
- Oven mitts: Safety first when handling hot dishes!
Mastering French Onion Chicken Casserole: How-To

Step 1: Preheat the Oven
Preheat your oven to 350°F (175°C). This ensures that your casserole cooks evenly throughout.
Step 2: Prepare the Chicken
If you are using leftover or rotisserie chicken, shred it into bite-sized pieces and set it aside. This will help it mix well with the other ingredients.
Step 3: Mix the Base
In a large mixing bowl, combine the condensed cream of chicken soup, sour cream, dry onion soup mix, garlic powder, salt, and pepper. Stir until well combined.
Step 4: Add Chicken and Broccoli
Fold in the shredded chicken and broccoli florets into the mixture. Make sure everything is evenly coated with the creamy base.
Step 5: Assemble the Casserole
Transfer the mixture into a greased 9×13 inch baking dish. Spread it out evenly, ensuring that the broccoli and chicken are well distributed.
Step 6: Add Cheese and Topping
Sprinkle the shredded cheddar cheese evenly over the top of the casserole. Then, add the crispy French fried onions on top of the cheese for an extra layer of crunch.
Step 7: Bake
Place the casserole in the preheated oven and bake for about 25-30 minutes, or until the cheese is melted and bubbly, and the onions are golden brown.
Step 8: Serve and Enjoy
Remove the casserole from the oven and let it cool for a few minutes before serving. This dish pairs wonderfully with a simple green salad or some crusty bread to soak up the creamy sauce.
In-Season Flavor Ideas

- Add sautéed mushrooms for an earthy depth.
- Incorporate fresh herbs like thyme or rosemary for added aroma.
- Swap out broccoli for green beans or spinach for a different texture.
- Use different types of cheese, such as gouda or mozzarella, for a unique flavor profile.
Insider Tips
- For extra flavor, consider marinating your chicken in a little bit of lemon juice and olive oil before cooking.
- If you prefer a thicker casserole, use less sour cream or add a handful of breadcrumbs to the mix.
- Feel free to experiment with spices; smoked paprika or cayenne can add a nice kick!
- To make this dish even heartier, serve it over cooked rice or quinoa.
Shelf Life & Storage
This French Onion Chicken Casserole can be stored in the refrigerator for up to 3-4 days. Make sure to cover it tightly with plastic wrap or aluminum foil to keep it fresh. You can also freeze leftovers for up to 2 months. Just be sure to thaw in the refrigerator before reheating.
Reader Questions
Can I use fresh chicken instead of cooked?
Yes! If you prefer using fresh chicken, simply cook and shred it before mixing it into the casserole. You may need to increase the baking time slightly to ensure the chicken is fully cooked.
Is there a vegetarian option for this casserole?
Absolutely! You can replace the chicken with cooked lentils or chickpeas and use vegetable broth instead of chicken soup for a delicious vegetarian version.
How can I make this dish gluten-free?
To make it gluten-free, use a gluten-free condensed cream of chicken soup and ensure that the onion soup mix is gluten-free as well. There are many brands available that cater to gluten-free diets.
Can I make this casserole ahead of time?
Yes! You can assemble the casserole ahead of time and store it in the refrigerator for up to 24 hours before baking. Just add a few extra minutes to the baking time if it’s coming straight from the fridge.
Try These Next
- Creamy Chicken and Rice Casserole
- Cheesy Broccoli and Chicken Bake
- One-Pan Garlic Chicken and Vegetables
- Savory Beef and Mushroom Casserole
Ready, Set, Cook
This French Onion Chicken Casserole is a perfect blend of convenience and comfort, making it a fantastic addition to your weeknight dinner rotation. With its creamy texture, savory flavors, and satisfying crunch, it’s bound to please even the pickiest eaters. Whether you’re cooking for a family gathering or just a cozy night in, this dish is sure to impress. So gather your ingredients, preheat the oven, and get ready to enjoy a culinary hug in a dish!

French Onion Chicken Casserole
Ingredients
For the Casserole:
- 1 can condensed cream of chicken soup 10.5-ounce
- 1 cup sour cream
- 1 packet dry Lipton Onion Recipe Soup and Dip Mix
- 1 teaspoon garlic powder
- 2 teaspoons salt
- 1 teaspoon freshly ground black pepper
- 4 cups shredded cooked chicken
- 2 cups broccoli florets
- 1 cup shredded cheddar cheese
- 1 cup crispy French fried onions
Instructions
Instructions:
- Preheat your oven to 350°F (175°C).
- If using leftover or rotisserie chicken, shred it into bite-sized pieces and set aside.
- In a large mixing bowl, combine the condensed cream of chicken soup, sour cream, dry onion soup mix, garlic powder, salt, and pepper. Stir until well combined.
- Fold in the shredded chicken and broccoli florets into the mixture.
- Transfer the mixture into a greased 9x13 inch baking dish and spread it out evenly.
- Sprinkle the shredded cheddar cheese evenly over the top, then add the crispy French fried onions.
- Place the casserole in the preheated oven and bake for about 25-30 minutes, or until the cheese is melted and bubbly.
- Remove the casserole from the oven and let it cool for a few minutes before serving.
Equipment
- Large Mixing Bowl
- 9x13 inch Baking Dish
- Measuring cups and spoons
- Spatula or wooden spoon
- Oven mitts
Notes
- Store leftovers in the refrigerator for up to 3-4 days.
- Freeze leftovers for up to 2 months; thaw before reheating.
- Experiment with different vegetables like green beans or spinach.
