If you are looking for a comforting casserole that delivers all the classic flavours of Chicken Cordon Bleu without the work of rolling and breading individual chicken breasts, this Cheesy Baked Chicken Cordon Bleu Casserole is a perfect choice. Tender chicken, savoury ham, Swiss cheese, and a creamy Dijon-Parmesan sauce are layered together and finished with a buttery golden breadcrumb topping.
This recipe is perfect for busy weeknights, family dinners, potlucks, or using leftover cooked chicken and ham. It has the familiar combination of chicken, ham, and Swiss cheese, but everything comes together in one simple baking dish.
One of the best things about homemade Chicken Cordon Bleu casserole is how easy it is to customise. You can use rotisserie chicken, leftover holiday ham, different cheeses, add broccoli or spinach, or make the topping extra crunchy with Parmesan and panko.
Why You’ll Love This Cheesy Baked Chicken Cordon Bleu Casserole
This casserole gives you the rich, cheesy flavor of traditional Chicken Cordon Bleu with much less preparation.
Using cooked chicken means there is no pounding, stuffing, rolling, or securing chicken breasts with toothpicks.
The creamy sauce combines Dijon mustard, garlic, Parmesan, milk, and cream for a smooth savory flavor that complements both the ham and Swiss cheese.
A buttery panko topping provides the crispy element you expect from classic Cordon Bleu while keeping the recipe easy enough for a weeknight meal.
Ingredients
For the Chicken and Ham Layer
- 4 cups cooked chicken, chopped or shredded
- 2 cups cooked ham, diced
- ½ teaspoon garlic powder
- ½ teaspoon onion powder
- ¼ teaspoon freshly ground black pepper
- 1 tablespoon Dijon mustard
For the Creamy Dijon Sauce
- 3 tablespoons unsalted butter
- 3 garlic cloves, finely minced
- 3 tablespoons all-purpose flour
- 1½ cups whole milk
- 1 cup heavy cream
- 1 cup low-sodium chicken broth
- 2 tablespoons Dijon mustard
- ½ cup freshly grated Parmesan cheese
- ½ teaspoon garlic powder
- ½ teaspoon onion powder
- ¼ teaspoon freshly ground black pepper
- Pinch of nutmeg, optional
- Salt to taste
For the Cheese Layer
- 2 cups shredded Swiss cheese
- 1 cup shredded mozzarella cheese
- ¼ cup freshly grated Parmesan cheese
For the Crispy Topping
- 1 cup panko breadcrumbs
- 3 tablespoons unsalted butter, melted
- ¼ cup freshly grated Parmesan cheese
- ½ teaspoon garlic powder
- ½ teaspoon dried parsley or Italian seasoning
For Garnishing
- Freshly chopped parsley
- Extra Parmesan
- Freshly ground black pepper
How to Make Cheesy Baked Chicken Cordon Bleu Casserole
1. Preheat the Oven
Preheat your oven to 375°F (190°C).
Lightly grease a 9×13-inch baking dish with butter or nonstick cooking spray.
Set it aside while you prepare the filling.
2. Prepare the Chicken
Place the cooked chicken in a large bowl.
You can use roasted chicken, poached chicken, leftover baked chicken, or rotisserie chicken.
Chop or shred it into bite-sized pieces.
Add garlic powder, onion powder, black pepper, and Dijon mustard.
Toss until the chicken is lightly seasoned.
If using rotisserie chicken, taste before adding any additional salt because it may already be well seasoned.
3. Prepare the Ham
Dice the cooked ham into small bite-sized pieces.
Try to keep the pieces relatively uniform so they distribute evenly throughout the casserole.
Add the ham to the seasoned chicken and toss gently.
Set aside.
4. Start the Creamy Sauce
Melt the butter in a medium saucepan over medium-low heat.
Add the minced garlic.
Cook for approximately 30–60 seconds, stirring constantly, until fragrant.
Do not allow the garlic to become dark brown.
5. Make the Roux
Sprinkle the flour over the garlic butter.
Whisk continuously for approximately 1–2 minutes.
The mixture should become smooth and lightly bubbly.
Cooking the flour briefly removes the raw flour flavor and helps create a smooth sauce.
6. Add the Milk, Cream, and Broth
Slowly pour in the milk while whisking continuously.
Add the heavy cream and chicken broth.
Continue whisking until smooth.
Bring the mixture to a gentle simmer over medium-low heat.
Cook for approximately 4–6 minutes, stirring frequently, until the sauce begins to thicken.
7. Add the Dijon and Parmesan
Reduce the heat to low.
Whisk in the Dijon mustard.
Add the Parmesan gradually.
Stir in the garlic powder, onion powder, black pepper, and nutmeg if using.
Continue stirring until the Parmesan melts and the sauce becomes smooth and creamy.
Taste before adding salt because ham, Swiss cheese, Parmesan, and broth can all contribute significant saltiness.
The finished sauce should be thick enough to coat the back of a spoon.
8. Assemble the Chicken Layer
Spread the chicken and ham mixture evenly across the prepared baking dish.
Avoid packing it down too tightly.
Keeping the meat loosely arranged allows the sauce to move between the pieces.
9. Add the Cream Sauce
Pour the warm Dijon Parmesan sauce evenly over the chicken and ham.
Use a spatula or spoon to gently spread it toward the corners.
Make sure most of the meat is coated with sauce.
10. Add the Cheese
Sprinkle the Swiss cheese evenly over the casserole.
Add the mozzarella.
Finish with Parmesan.
Swiss cheese provides the traditional Chicken Cordon Bleu flavor, while mozzarella gives the casserole an extra melty texture.
11. Prepare the Crispy Topping
In a small bowl, combine the panko breadcrumbs, melted butter, Parmesan, garlic powder, and dried parsley or Italian seasoning.
Stir until the breadcrumbs are evenly coated.
Sprinkle the mixture over the cheese layer.
Spread it evenly so every serving gets some crunchy topping.
12. Bake the Casserole
Place the baking dish in the preheated oven.
Bake uncovered for approximately 25–30 minutes.
The sauce should be bubbling around the edges and the cheese should be completely melted.
The breadcrumb topping should become golden and crisp.
13. Brown the Top
For an extra-crispy finish, switch the oven to broil for approximately 1–2 minutes.
Watch closely.
The breadcrumbs and cheese can brown very quickly.
Remove the casserole as soon as the topping becomes deeply golden.
14. Rest Before Serving
Remove the casserole from the oven.
Allow it to rest for approximately 8–10 minutes.
This allows the creamy sauce to thicken slightly and makes the casserole easier to portion.
Sprinkle with fresh parsley, Parmesan, and black pepper before serving.
What to Serve With Cheesy Baked Chicken Cordon Bleu Casserole
Creamy mashed potatoes are one of the best side dishes for this casserole because they pair beautifully with the Dijon cream sauce.
Roasted baby potatoes, scalloped potatoes, or garlic Parmesan potatoes also work well.
For vegetables, serve it with roasted broccoli, asparagus, green beans, carrots, Brussels sprouts, or sautéed spinach.
A crisp garden salad or Caesar salad adds freshness and helps balance the richness of the cheese and sauce.
For a lower-carb meal, serve the casserole with cauliflower mash or roasted cauliflower.
Tips for the Best Cheesy Baked Chicken Cordon Bleu Casserole
Use cooked chicken that is still moist rather than dry.
Dice the ham into small pieces so it distributes evenly.
Taste before adding extra salt.
Keep the heat low when adding Parmesan to the sauce.
Use freshly shredded cheese whenever possible for smoother melting.
Do not overbake the casserole because the chicken is already cooked.
Use panko rather than fine breadcrumbs for a crunchier topping.
Let the casserole rest before serving.
If the sauce looks very thick before baking, add a small splash of chicken broth.
Broil only briefly at the end because the breadcrumb topping can burn quickly.
Easy Recipe Variations
Chicken Cordon Bleu Broccoli Casserole
Add 2–3 cups lightly steamed broccoli florets to the chicken and ham mixture.
Bacon Cordon Bleu Casserole
Add 6 slices of cooked, crumbled bacon for extra smoky flavor.
Mushroom Chicken Cordon Bleu Casserole
Sauté 8 ounces sliced mushrooms and add them before pouring in the cream sauce.
Extra Cheesy Cordon Bleu Casserole
Add Gruyère, provolone, or additional Swiss cheese.
Spinach Chicken Cordon Bleu Casserole
Stir 2 cups cooked, well-drained spinach into the filling.
Low-Carb Cordon Bleu Casserole
Omit the breadcrumb topping and finish with Parmesan and cheese instead.
Spicy Cordon Bleu Casserole
Add red pepper flakes, cayenne, or pepper Jack cheese.
Turkey Cordon Bleu Casserole
Replace the chicken with cooked turkey, making this a useful recipe for holiday leftovers.
How to Store Leftovers
Allow leftover casserole to cool before transferring it to an airtight container.
Store in the refrigerator for up to 3–4 days.
To reheat, place individual portions in a covered baking dish and warm at 325–350°F until heated through.
You can add a small splash of milk or chicken broth if the sauce has become very thick.
Individual portions can also be reheated in the microwave using short intervals.
For the best breadcrumb texture, the oven or air fryer is preferable.
The casserole can be frozen for up to approximately 2 months.
For best results, freeze without the breadcrumb topping and add fresh breadcrumbs before reheating or baking.
Thaw overnight in the refrigerator.
Frequently Asked Questions
Can I use rotisserie chicken?
Yes.
Rotisserie chicken is one of the easiest options for this recipe.
Remove the skin and bones and use approximately 4 cups chopped or shredded chicken.
What cheese is traditionally used in Chicken Cordon Bleu?
Swiss cheese is the classic choice.
Gruyère is another excellent option with a slightly richer and nuttier flavor.
Can I use leftover ham?
Absolutely.
Leftover baked or holiday ham works extremely well.
Dice it into bite-sized pieces before adding it to the casserole.
Can I make this casserole ahead of time?
Yes.
Assemble the chicken, ham, sauce, and cheese layers up to approximately 24 hours ahead.
Cover and refrigerate.
Add the breadcrumb topping shortly before baking for the best crispness.
Can I add pasta?
Yes.
Mix in approximately 8–10 ounces of cooked pasta such as penne, bowties, or rotini.
You may need to increase the sauce slightly so the casserole stays creamy.
Can I make it without heavy cream?
Yes.
Replace the heavy cream with additional whole milk or half-and-half.
The sauce will be slightly lighter.
Why did my sauce turn grainy?
The heat may have been too high when the Parmesan was added.
Reduce the heat and add cheese gradually while stirring.
Can I make this gluten-free?
Yes.
Use a gluten-free flour blend or cornstarch to thicken the sauce and gluten-free breadcrumbs for the topping.
Final Thoughts
This Cheesy Baked Chicken Cordon Bleu Casserole combines juicy chicken, savory ham, melted Swiss and mozzarella, creamy Dijon Parmesan sauce, and a crispy buttery breadcrumb topping in one comforting dish.
It gives you all the familiar flavors of classic Chicken Cordon Bleu without the extra work of stuffing, rolling, and breading individual chicken breasts.
Serve it warm with mashed potatoes, roasted vegetables, salad, or cauliflower mash, and enjoy a creamy, cheesy family dinner with plenty of savory ham and chicken flavor in every bite.