Chicken Cordon Bleu Casserole (Printable)

Layers of chicken, ham, Swiss and creamy Dijon sauce, finished with a crisp Parmesan-Panko topping.

# What You'll Need:

→ Meats

01 - 4 cups cooked chicken breast, diced or shredded
02 - 1 cup cooked ham, diced

→ Dairy

03 - 2 cups Swiss cheese, shredded
04 - 1/2 cup Parmesan cheese, grated
05 - 2 cups whole milk
06 - 4 tablespoons unsalted butter

→ Vegetables

07 - 1 small yellow onion, finely diced
08 - 2 cloves garlic, minced

→ Dry Goods

09 - 1/4 cup all-purpose flour
10 - 1 cup Panko breadcrumbs

→ Condiments & Seasonings

11 - 2 tablespoons Dijon mustard
12 - 1/2 teaspoon kosher salt
13 - 1/2 teaspoon black pepper
14 - 1/4 teaspoon smoked paprika

# Steps:

01 - Preheat the oven to 375°F (190°C). Grease a 9x13-inch baking dish and set aside.
02 - Melt unsalted butter in a saucepan over medium heat. Add the diced onion and minced garlic, cooking for 2 to 3 minutes until softened.
03 - Whisk in all-purpose flour and cook for 1 minute to eliminate raw flavor. Gradually pour in whole milk while whisking constantly, ensuring the mixture is smooth. Simmer for 3 to 4 minutes until slightly thickened.
04 - Incorporate Dijon mustard, kosher salt, black pepper, and smoked paprika. Stir well and remove the sauce from the heat.
05 - In the prepared baking dish, create a base layer with half the chicken. Top with all the diced ham, followed by half the Swiss cheese. Repeat, layering the remaining chicken and Swiss cheese.
06 - Distribute the prepared cream sauce evenly over the layered ingredients, ensuring full coverage.
07 - In a mixing bowl, combine Panko breadcrumbs with grated Parmesan cheese. Sprinkle this mixture evenly across the surface.
08 - Place the dish uncovered in the oven and bake for 30 to 35 minutes, or until the topping is golden and the casserole is bubbling at the edges.
09 - Let the casserole rest for 5 minutes after baking to allow the sauce to set before serving.

# Expert Tips:

01 -
  • This casserole tastes like a fancy comfort food secret that takes almost no effort compared to individual cutlets.
  • The harmony of creamy Dijon sauce, melty cheese, and crisp breadcrumbs won everyone over even on the pickiest nights.
02 -
  • If you rush the sauce and don’t whisk constantly, you’ll end up with frustrating flour lumps—patience pays off here.
  • Letting the casserole rest before serving makes all the difference; it transforms from loose and soupy to perfect, sliceable comfort.
03 -
  • Use rotisserie chicken on weeknights to save time and add extra flavor.
  • A dash of smoked paprika on top before baking gives an extra-special look and aroma your guests will love.

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