Why You’ll Love This Recipe

• All the classic flavors of Chicken Cordon Bleu in a simple casserole form.
• No pounding, rolling, or securing with toothpicks required.
• Ready in under an hour, making it a perfect weeknight dinner.
• Features a rich, creamy, and flavorful homemade Dijon cheese sauce.
• A guaranteed crowd-pleaser for both kids and adults.

Equipment You’ll Need

• 9×13 inch baking dish
• Large skillet or saucepan
• Whisk
• Measuring cups and spoons
• Cheese grater
• Small mixing bowl

Ingredients

• 4 cups cooked chicken, shredded or cubed (about 1 rotisserie chicken)
• 8 ounces cooked ham, diced
• 8 ounces Swiss cheese, shredded and divided
• For the Sauce:
• 4 tablespoons unsalted butter
• 1/4 cup all-purpose flour
• 2 cups milk (whole or 2%)
• 1/2 cup chicken broth
• 2 tablespoons Dijon mustard
• 1 teaspoon garlic powder
• 1/2 teaspoon onion powder
• 1/2 teaspoon black pepper
• 1/4 teaspoon salt (adjust to taste, as ham and cheese are salty)
• For the Topping:
• 1 cup panko breadcrumbs
• 1/4 cup grated Parmesan cheese
• 3 tablespoons unsalted butter, melted

Instructions

1. Preheat your oven to 375°F (190°C). Lightly grease a 9×13 inch baking dish.
2. In the prepared baking dish, spread the cooked chicken and diced ham in an even layer. Sprinkle half of the shredded Swiss cheese (4 ounces) over the meat mixture.
3. To make the sauce, melt 4 tablespoons of butter in a large skillet or saucepan over medium heat. Once melted, whisk in the flour and cook for 1-2 minutes, stirring constantly, to form a blond roux. This cooks out the raw flour taste.
4. Gradually pour in the milk and chicken broth while whisking continuously to prevent lumps. Continue to cook, whisking frequently, until the sauce thickens enough to coat the back of a spoon, about 5-7 minutes.
5. Remove the sauce from the heat. Whisk in the Dijon mustard, garlic powder, onion powder, black pepper, and salt. Stir until smooth and fully combined.
6. Pour the creamy Dijon sauce evenly over the chicken, ham, and cheese in the baking dish.
7. Sprinkle the remaining half of the shredded Swiss cheese over the sauce.
8. In a small bowl, combine the panko breadcrumbs, grated Parmesan cheese, and 3 tablespoons of melted butter. Mix until the breadcrumbs are evenly coated.
9. Sprinkle the panko topping evenly over the entire casserole.
10. Bake uncovered for 25-30 minutes, or until the sauce is bubbly and the topping is golden brown and crisp.
11. Remove from the oven and let the casserole rest for 5-10 minutes before serving. This allows the sauce to set slightly.

Expert Cooking Tips

• Use a rotisserie chicken for a major time-saver. Simply shred the meat and you’re ready to go.
• For the best, meltiest cheese, buy a block of Swiss cheese and shred it yourself. Pre-shredded cheeses often contain anti-caking agents that can affect how they melt.
• When making the sauce, add the liquid slowly and whisk constantly. This is the key to a smooth, lump-free cream sauce.
• Don’t skip the resting period after baking. It helps the casserole firm up, making it much easier to serve clean portions.

Substitutions and Variations

Cheese: Gruyère, Provolone, or a mix of mozzarella and cheddar can be used in place of Swiss. Ham: Diced prosciutto, pancetta, or even cooked and crumbled bacon would be delicious. Topping: Crushed Ritz crackers or classic breadcrumbs can be substituted for panko, though panko provides the best crunch. Gluten-Free: To make this gluten-free, use a 1:1 gluten-free all-purpose flour blend for the sauce and gluten-free breadcrumbs for the topping.

Common Mistakes to Avoid

Sauce is too thin: If your sauce doesn’t thicken, it may not have cooked long enough. Let it simmer a few more minutes. If it’s still thin, you can make a small slurry of 1 tablespoon cornstarch and 2 tablespoons cold water and whisk it in. Sauce is too thick: If the sauce becomes too thick, simply whisk in a little more milk or chicken broth until it reaches the desired consistency. Forgetting to season the sauce: The sauce is the flavor backbone. Be sure to add the Dijon, garlic powder, onion powder, salt, and pepper for a well-rounded taste.

Serving Suggestions

This rich casserole pairs beautifully with simple, fresh sides. Serve with a side of steamed green beans, roasted asparagus, or a crisp green salad with a light vinaigrette. It’s also wonderful served over a bed of egg noodles or with a side of fluffy white rice to soak up the delicious sauce.

Storage and Reheating Tips

Store leftovers in an airtight container in the refrigerator for up to 4 days. Reheat individual portions in the microwave or place the entire baking dish (covered with foil) in a 350°F oven until warmed through. The topping will lose some of its crispness upon reheating, but will still be delicious.

Frequently Asked Questions

Can I make this casserole ahead of time?

Yes, you can assemble the entire casserole without the breadcrumb topping up to 24 hours in advance. Cover and refrigerate. When ready to bake, add the panko topping and bake as directed, adding 10-15 minutes to the cooking time to account for the cold dish.

Can I freeze this casserole?

Yes. Assemble the casserole but do not bake it or add the topping. Cover tightly with plastic wrap and then foil, and freeze for up to 3 months. Thaw overnight in the refrigerator before adding the topping and baking as directed, adding 15-20 minutes to the cook time.

What kind of ham is best for this recipe?

Deli ham (like Black Forest or Virginia ham) from the deli counter, asked for in a thick slice, is perfect for dicing. You can also use leftover baked ham. Avoid overly sweet hams like honey-glazed, as they can alter the savory profile of the dish.

Conclusion

With this Lazy Chicken Cordon Bleu Casserole, you can bring a touch of French-inspired elegance to your dinner table any night of the week. It’s a warm, comforting, and utterly satisfying dish that proves you don’t need complex techniques to create incredible flavor. Give this recipe a try and watch it become a new family favorite.