This Small-Batch Chicken Cordon Bleu Casserole is creamy, cheesy, and topped with golden panko crumbs. Made with rotisserie chicken, ham, Gruyère cheese, and a Dijon cream sauce, it delivers classic chicken cordon bleu flavors in a quick, weeknight-friendly casserole for two to four.
Preheat the oven to 375°F. Spray a 1 ½-quart baking dish with nonstick spray. Set aside.
In a small saucepan, melt 1 tablespoon of butter over medium heat. Stir in flour; cook 1 minute. Slowly whisk in milk; cook until slightly thickened, around 3 to 4 minutes. Whisk in Dijon mustard, garlic powder, salt, and pepper. Remove from heat and whisk in ½ cup Gruyère until smooth.
Spread the chicken and ham evenly in the prepared casserole dish. Sprinkle with ½ cup of Gruyère cheese.
Pour the sauce over the chicken, ham, and Gruyère cheese. Top with the remaining ¼ cup of Gruyère cheese.
Melt the remaining 2 tablespoons of butter. Mix the melted butter, Panko breadcrumbs, and Parmesan cheese in a small bowl. Sprinkle evenly over the top of the casserole. (See Tip 3)
Bake uncovered at 375°F for 25 to 30 minutes, until bubbly and golden brown.
Garnish with parsley if desired.
Yield: 2 to 4 servings.
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Tips/Notes
Rotisserie chicken and ham tend to be salty. Therefore, add additional salt sparingly.
May use chicken breasts, cut into pieces, and cooked until no longer pink in place of the rotisserie chicken.
May be prepared in advance up to this point. Cover tightly, and refrigerate up to 24 hours. Bake uncovered, straight from the refrigerator, adding 10 extra minutes to the baking time.