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A golden-baked Chicken Cordon Bleu Casserole in a white dish, with a serving scooped out to show the creamy layers.

Game Changing Chicken Cordon Bleu Casserole

This recipe deconstructs the classic Chicken Cordon Bleu into an easy, weeknight-friendly casserole. It features tender chicken and savory ham in a rich, creamy Dijon and Swiss cheese sauce, all finished with a crispy, golden-brown panko breadcrumb topping.
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Prep Time 15 minutes
Cook Time 35 minutes
Total Time 50 minutes
Servings: 6
Course: Main Course
Cuisine: American, French
Calories: 650
Ingredients Equipment Method Notes

Ingredients
  

  • 4 cups cooked chicken, shredded or cubed
  • 2 cups cooked ham, diced
  • 2 cups Swiss or Gruyère cheese, shredded and divided
  • 6 tablespoons unsalted butter, divided
  • 1/4 cup all-purpose flour
  • 1.5 cups whole milk
  • 1 cup chicken broth
  • 2 tablespoons Dijon mustard
  • 1 teaspoon garlic powder
  • 1 teaspoon onion powder
  • 1 cup panko breadcrumbs
  • 1/2 teaspoon salt, or to taste
  • 1/4 teaspoon black pepper, or to taste
  • 2 tablespoons fresh parsley, chopped, for garnish

Equipment

  • 9x13 inch baking dish
  • Large bowl
  • Small bowl
  • Medium saucepan or skillet
  • Whisk
  • Spatula
  • Measuring cups and spoons
  • Fork

Method
 

  1. Preheat oven to 375°F (190°C). Lightly grease a 9x13 inch baking dish.
  2. Prepare the topping: In a small bowl, melt 2 tablespoons of butter. Add the panko breadcrumbs and a pinch of salt and pepper. Toss with a fork until the breadcrumbs are evenly coated. Set aside.
  3. Combine the filling: In a large bowl, combine the cooked chicken, diced ham, and 1 cup of the shredded cheese. Toss to mix, then spread the mixture evenly in the prepared baking dish.
  4. Make the sauce: In a medium saucepan over medium heat, melt the remaining 4 tablespoons of butter. Whisk in the all-purpose flour and cook for 1 minute, stirring constantly, to form a roux.
  5. Slowly pour in the chicken broth while whisking continuously to prevent lumps. Then, gradually whisk in the milk. Cook, whisking frequently, for 5-7 minutes until the sauce bubbles and thickens.
  6. Reduce heat to low. Stir in the Dijon mustard, garlic powder, onion powder, salt, and pepper. Simmer for 1 minute to meld the flavors.
  7. Remove the saucepan from the heat. Stir in the remaining 1 cup of shredded cheese until fully melted and the sauce is smooth. Taste and adjust seasoning if necessary.
  8. Assemble and bake: Pour the cream sauce evenly over the chicken and ham mixture in the baking dish, ensuring it covers everything.
  9. Sprinkle the prepared panko topping evenly over the sauce.
  10. Bake for 20-25 minutes, or until the sauce is bubbly and the topping is deep golden brown.
  11. Let the casserole rest for 5-10 minutes before serving to allow the sauce to set. Garnish with fresh parsley and serve warm.

Notes

Variations: For an earthier flavor, add 8 ounces of sautéed mushrooms with the chicken. For extra richness, add a splash (1/4 cup) of dry white wine to the roux before the liquids, or add 1 teaspoon of fresh thyme to the sauce.
Ingredient Swaps: No Swiss or Gruyère? Use sharp white cheddar or provolone. No panko? Use crushed Ritz crackers. For a richer sauce, replace 1/2 cup of milk with heavy cream.
Pro Tips: For a perfectly smooth sauce, add liquids to the roux slowly while whisking, and remove the sauce from the heat before stirring in the cheese. Tossing the panko in melted butter is essential for a crispy, non-soggy topping.