Chicken Cordon Bleu Casserole

Chicken cordon bleu casserole takes everything you love about the classic French-inspired dish and turns it into something you can actually make on a weeknight without rolling, stuffing, or pan-frying a single thing. Same flavors — creamy Dijon sauce, smoky ham, melted Swiss — just assembled in a baking dish and topped with buttery Panko breadcrumbs that go golden in the oven.

This one showed up in my kitchen because my older daughter loves the original but I absolutely do not have the patience for it on a Tuesday night. A casserole version that takes 15 minutes to put together? That I can do. And honestly, the family reaction was the same either way — clean plates.

Here’s the thing: the Dijon cream sauce is what makes this dish. It’s silky, just a little sharp, and it pulls the chicken, ham, and broccoli together in a way that feels intentional and complete.

Why You’ll Love This Chicken Cordon Bleu Casserole

Everything that makes the original special is still here, just without the technique.

The Dijon cream sauce is made from scratch and it comes together in under 10 minutes. Butter, garlic, a roux, milk, broth, and Parmesan — simple building blocks that produce something that tastes genuinely homemade.

The Panko topping goes buttery and crunchy in the oven, which gives you that textural contrast against the creamy filling that makes every bite interesting.

Rotisserie chicken makes prep incredibly fast. There’s no raw chicken to deal with, which cuts down both the prep time and the cleanup.

It feeds six comfortably and holds well, so it works just as well for a family dinner as it does for a potluck or a make-ahead meal.

The broccoli cooks right in the casserole, which means one less pot to wash.

Leftovers reheat well — my husband confirmed this with two consecutive lunch reports — and the whole thing can be assembled the night before and refrigerated until you’re ready to bake.

Ingredients for Chicken Cordon Bleu Casserole

I’ve made a lot of cream sauce in my years of home cooking, and my strong preference is always freshly grated Parmesan over the shelf-stable kind. The difference in how it melts into the sauce is noticeable — fresh Parmesan dissolves smoothly, while the pre-grated variety can leave the sauce slightly grainy. It’s worth the extra minute with a box grater.

For the Dijon Cream Sauce:

• 3 tablespoons unsalted butter
• 2 cloves garlic, grated or minced
• 3 tablespoons all-purpose flour
• 1/2 cup chicken broth
• 1 1/2 cups milk (skim or whole)
• 1 tablespoon Dijon mustard
• 1 teaspoon chicken or vegetable bouillon powder
• 1/4 cup Parmesan cheese, freshly grated
• Salt and black pepper, to taste
• 2 tablespoons fresh parsley, optional, for garnish

For the Casserole:

• 2 cups fresh broccoli florets, uncooked
• 4 cups cooked or rotisserie chicken, shredded or diced
• 2 cups diced ham
• 2 cups Swiss cheese, shredded
• 1/4 cup Parmesan cheese, freshly grated

For the Topping:

• 1 cup Panko breadcrumbs
• 2 tablespoons butter, melted

A few notes on swaps: Swiss cheese is classic here, but Emmental, Jarlsberg, or even a mild white cheddar all work well if Swiss isn’t your family’s preference. For the ham, I use a good deli ham cut into chunks, but turkey ham is a perfectly solid lighter option. And if broccoli isn’t a hit at your table, cauliflower florets, asparagus cut into pieces, or a cup of frozen peas all sub in without changing the method at all.

How to Make Chicken Cordon Bleu Casserole

The most important technique in this recipe is the roux for the Dijon cream sauce. Cooking the flour in the butter for a full minute before adding any liquid is what removes that raw flour taste and gives the sauce a smooth, velvety body. Rushing past that step is the main reason cream sauces end up tasting flat or starchy — so set a timer if you need to and don’t skip it.

1. Preheat the oven to 375°F (190°C) and lightly grease a 2-quart casserole dish.
2. Melt the butter in a small saucepan over medium heat. Add the garlic and cook for about 30 seconds until fragrant — you’ll smell it immediately.
3. Reduce the heat to low and whisk in the flour. Cook for 1 minute, whisking constantly. The mixture will look thick and pale.
4. Gradually whisk in the chicken broth, then the milk, adding them slowly to keep the sauce smooth. Rushing this step can cause lumps, so take your time.
5. Stir in the Dijon mustard, bouillon powder, and Parmesan cheese. Simmer gently, stirring frequently, until the sauce thickens enough to coat the back of a spoon — about 4 to 5 minutes. Season with salt and black pepper to taste. Pro tip: taste the sauce before you season it. The Parmesan and bouillon both bring salt, so you may need less than you think.
6. Spread the cooked chicken evenly across the bottom of the prepared casserole dish in a single layer.
7. Layer the raw broccoli florets over the chicken, then add the diced ham evenly over the top.
8. Pour the Dijon cream sauce slowly and evenly over the entire casserole, making sure it settles down through the layers.
9. Sprinkle the shredded Swiss cheese and grated Parmesan over the top.
10. In a small bowl, stir together the Panko breadcrumbs and melted butter until the crumbs are evenly coated. Spread this mixture over the cheese layer. Pro tip: don’t press the breadcrumbs down. A light, loose layer gets crispier in the oven than a packed one.
11. Bake uncovered for 30 minutes, until the top is golden brown and the sauce is bubbling around the edges.
12. Remove from the oven and let rest for 5 minutes before serving. Garnish with fresh parsley if you like.

Common mistake to avoid: pulling it straight from the oven and serving immediately. That 5-minute rest lets the sauce settle so it stays creamy on the plate instead of running.

What to Serve with Chicken Cordon Bleu Casserole

The casserole already has protein, vegetables, and a rich cream sauce built in, so sides that add lightness and contrast work best here.

A simple green salad with a sharp vinaigrette is the most natural pairing. The acidity cuts through the richness of the Dijon cream sauce in a way that resets the palate between bites.

Crusty French bread or a soft dinner roll on the side is always welcome, especially for anyone who wants something to scoop up the extra sauce from the bottom of the dish.

Steamed rice is a quiet, neutral option that absorbs the sauce well without competing with the flavors already in the casserole.

Roasted asparagus or green beans are fast vegetable sides that go in the oven alongside the casserole — just toss with olive oil and a pinch of salt and they’re done by the time the casserole comes out.

Glazed carrots add a little sweetness to the plate, which balances well against the Dijon and ham.

A light soup, like a simple tomato or vegetable broth, makes this feel like a full spread if you’re serving guests and want a first course without much extra effort.

Pro Tips and Variations

Tip 1: I find that dicing the ham slightly smaller than you think you need to gives a better distribution through the casserole. Big chunks tend to cluster, while smaller pieces spread through every forkful.

Tip 2: If you’re using rotisserie chicken, pull it while it’s still warm — it shreds much more easily than cold chicken. I use two forks directly over the casserole dish so the pieces fall right in.

Tip 3: For extra browning on the Panko, switch to broil for the last 2 to 3 minutes of bake time. Watch it closely — Panko goes from golden to burnt faster than regular breadcrumbs.

Tip 4: This casserole can be fully assembled, covered tightly, and refrigerated overnight. Pull it from the fridge about 20 minutes before baking so it’s not going into the oven ice cold, which can affect the bake time.

Lighter version: use skim milk in the sauce and reduce the Swiss cheese to 1 cup. The casserole is still creamy and satisfying, just a bit lighter overall.

Turkey swap: substitute turkey breast for the chicken and use turkey ham for a full turkey version — this is a great use for post-Thanksgiving leftovers.

Vegetable-heavy version: double the broccoli and reduce the ham to 1 cup. Cauliflower and asparagus together with the broccoli make this feel more vegetable-forward without losing any of the main flavors.

Extra cheesy version: add a layer of Gruyère between the chicken and the broccoli before pouring the sauce. It melts into a distinct layer that my girls have described as the best part.

Storage and Reheating Tips

Leftover chicken cordon bleu casserole keeps well in an airtight container in the refrigerator for up to 4 days. In my experience, it actually tastes slightly better on day two once the flavors have had time to settle together — my husband’s leftover test confirms this.

To reheat, cover the dish loosely with foil and warm in a 350°F (175°C) oven for about 15 minutes. This keeps the sauce from drying out and helps the Panko topping hold on to some of its texture. The microwave works for individual portions — cover loosely and heat in 60-second intervals, stirring gently between each.

This casserole also freezes well for up to 2 months. For best results, freeze it before baking rather than after, and add the Panko topping fresh when you’re ready to cook. Thaw overnight in the refrigerator before baking as directed.

Common Questions

Can I make this casserole ahead of time?

Yes, and it’s one of the things I love most about it. Assemble the entire casserole — sauce, layers, cheese, and breadcrumb topping — cover it tightly with plastic wrap or foil, and refrigerate for up to 24 hours before baking. Pull it from the fridge about 20 minutes before it goes into the oven. You may need to add 5 minutes to the bake time if it’s still cold in the center.

Can I use raw chicken instead of cooked?

The recipe is built around already-cooked chicken, so raw chicken isn’t a direct swap. If you want to start from raw, bake or poach the chicken breasts first, let them cool slightly, then shred or dice before assembling. Rotisserie chicken from the store is genuinely the fastest path here, and it adds a depth of flavor you won’t get from plain poached chicken.

What if my sauce looks lumpy?

This almost always comes from adding the liquid too quickly to the roux, or having the heat too high. If it happens, remove the pan from the heat and whisk vigorously — most small lumps will smooth out. If the sauce is significantly lumpy, pour it through a fine mesh strainer before adding the mustard and cheese. A quick pass with an immersion blender also works well and takes about 10 seconds.

One Last Thing

Chicken cordon bleu casserole is the kind of dinner that earns its place in heavy rotation fast. It has the flavors of a classic dish with none of the fussiness, and it’s the kind of meal that makes a weeknight feel a little more special than it has any right to. Make it once and I’m willing to bet it lands on your regular list.

Chicken Cordon Bleu Casserole

All the classic flavors of chicken cordon bleu — creamy Dijon sauce, ham, Swiss cheese, and a crispy Panko topping — baked together in one easy casserole dish.

Print Recipe Pin Recipe

Prep Time 15 minutes mins

Cook Time 30 minutes mins

Total Time 45 minutes mins

Course Dinner, Main Course

Cuisine American, French-Inspired

Servings 6 servings

Equipment

• 2-quart casserole dish
• Small saucepan
• Whisk

Ingredients

  

• 3 tbsp unsalted butter for the sauce
• 2 garlic cloves grated or minced
• 3 tbsp all-purpose flour
• 0.5 cup chicken broth
• 1.5 cup milk skim or whole
• 1 tbsp Dijon mustard
• 1 tsp chicken or vegetable bouillon powder
• 0.25 cup Parmesan cheese freshly grated, for the sauce
• salt and black pepper to taste
• 2 tbsp fresh parsley optional, for garnish
• 2 cup fresh broccoli florets uncooked
• 4 cup cooked chicken rotisserie or poached, shredded or diced
• 2 cup diced ham turkey ham may be substituted
• 2 cup Swiss cheese shredded; Emmental, Jarlsberg, or mild white cheddar can be substituted
• 0.25 cup Parmesan cheese freshly grated, for the casserole layer
• 1 cup Panko breadcrumbs
• 2 tbsp unsalted butter melted, for the topping

Instructions

 

• Preheat the oven to 375°F (190°C) and lightly grease a 2-quart casserole dish.
• Melt 3 tablespoons of butter in a small saucepan over medium heat. Add the garlic and cook for about 30 seconds until fragrant.
• Reduce the heat to low and whisk in the flour. Cook for 1 full minute, whisking constantly, to eliminate the raw flour taste.
• Gradually whisk in the chicken broth, then the milk, adding slowly to keep the sauce smooth and lump-free.
• Stir in the Dijon mustard, bouillon powder, and Parmesan cheese. Simmer gently, stirring frequently, until the sauce thickens enough to coat the back of a spoon, about 4 to 5 minutes. Season with salt and black pepper to taste.
• Spread the cooked chicken evenly across the bottom of the prepared casserole dish.
• Layer the raw broccoli florets over the chicken, then distribute the diced ham evenly over the top.
• Pour the Dijon cream sauce slowly and evenly over the chicken, broccoli, and ham layers.
• Sprinkle the shredded Swiss cheese and grated Parmesan evenly over the top of the casserole.
• In a small bowl, stir together the Panko breadcrumbs and melted butter until the crumbs are evenly coated. Sprinkle loosely over the cheese layer without pressing down.
• Bake uncovered for 30 minutes, or until the top is golden brown and the sauce is bubbling around the edges.
• Remove from the oven and allow to rest for 5 minutes before serving. Garnish with fresh parsley if desired.

Keyword chicken cordon bleu casserole, chicken ham and swiss casserole, dijon cream sauce chicken, easy chicken casserole, weeknight chicken dinner