Crispy Chicken Cordon Bleu Casserole Step-by-step instructions

Before you start

Before starting, preheat the oven to 375°F (190°C) and lightly grease a 9x13-inch baking dish with butter or nonstick cooking spray. Bring a large pot of salted water to a rolling boil.

Measure out all the ingredients, including the cooked chicken, diced ham, and shredded Swiss cheese, so they are ready for quick assembly. Chop the fresh parsley for the final garnish. Set up a large mixing bowl to combine the pasta, sauce, and proteins easily.

Instructions

Boiling Pasta and Making Sauce

1. 1Boil the Pasta
   Cook the penne pasta in a large pot of boiling salted water according to the package directions, but stop cooking about 2 minutes before it reaches al dente. Drain the pasta thoroughly and transfer it to a large mixing bowl.
   Look for The pasta should still have a firm bite in the center.
   Tip Do not rinse the pasta, as the natural starches help the sauce cling to it.

The penne pasta is boiled just under al dente so it retains a firm bite, then drained thoroughly and set aside, ready to be combined with the rich sauce and proteins.

Mixing and Layering

2. 2Combine Pasta and Proteins
   Add the cooked chicken and diced cooked ham to the large mixing bowl with the drained penne pasta. Pour the warm Dijon cream sauce over the mixture and toss gently with a large spoon until everything is evenly coated and well combined.
   Look for The pasta and meats should be fully enrobed in the creamy sauce.
   Tip Fold gently to avoid breaking the delicate cooked pasta shapes.
3. 3Layer into the Baking Dish
   Transfer the pasta mixture into a lightly greased 9x13-inch baking dish, spreading it into an even layer. Evenly scatter the shredded Swiss cheese over the top of the pasta.
   Look for The Swiss cheese should cover the pasta mixture completely.
   Tip Press down lightly with a spatula to compact the casserole slightly before baking.

The pasta, chicken, and ham are completely coated in the velvety Dijon cream sauce, spread evenly into the baking dish, and covered with a generous, uniform layer of shredded Swiss cheese.

Baking and Garnishing

4. 4Add Crisp Topping and Bake
   Sprinkle the buttery panko breadcrumbs evenly over the Swiss cheese layer. Bake in the preheated oven at 375°F (190°C) for 20 to 25 minutes.
   Look for The breadcrumbs should be golden brown and the cheese bubbly around the edges.
   Tip If the topping browns too quickly, tent the dish loosely with aluminum foil.
5. 5Garnish and Rest
   Remove the casserole from the oven and let it rest for 5 minutes. Sprinkle the freshly chopped parsley over the crispy golden crust before scooping and serving.
   Look for The casserole will settle slightly as it rests, making it easier to portion.
   Tip Resting prevents the hot sauce from running when you cut into the bake.

The casserole emerges hot and bubbling from the oven, boasting a beautifully even, golden-brown, and exceptionally crispy panko breadcrumb crust that is garnished with a sprinkle of fresh green parsley.

Common mistakes

One common mistake is overcooking the pasta during the initial boil. Because the penne bakes in a hot cream sauce, fully cooked pasta will turn mushy and lose its structure. Another error is using a sauce that is too thin, which can make the casserole watery instead of rich and creamy.

Lastly, using pre-shredded cheese from a bag can hinder melting; these products often contain anti-caking agents that prevent the Swiss cheese from achieving that ultra-creamy, stretchy consistency seen in the video.

How to tell it’s done

You can tell this casserole is perfectly cooked when the edges are bubbling intensely and the panko breadcrumb topping has achieved a beautiful, uniform golden-brown shade.

Since the chicken and ham are already fully cooked before assembly, the baking process is designed to heat the dish throughout, melt the Swiss cheese, and crisp the topping.

The internal temperature of the casserole should reach 165°F (74°C) when tested with an instant-read thermometer to ensure it is piping hot and safe to enjoy.