This Chicken Cordon Bleu Casserole is simple and delicious. It combines tender chicken and smokey, flavorful ham in a melty, creamy cheese sauce topped with crispy breadcrumbs. Your whole family will love it!
Preheat the oven to 350 degrees Fahrenheit and spray a 3-quart baking dish with pan spray.
Spread the shredded chicken in the bottom of the pan. Sprinkle the ham evenly over the chicken.
In a small bowl, stir together the melted butter, panko, Italian seasoning, and salt. Set aside.
Prepare the lemon cream sauce by melting the butter in a medium saucepan over medium heat. Once melted, add the flour and whisk to combine. Continue to whisk until the mixture becomes nutty and fragrant and the bubbling subsides, about 2 minutes.
Slowly whisk in the broth, milk, cream, and dijon. Whisk until smooth and thickened, about 3-4 minutes. Whisk in the cheese slowly, whisking until it is fully melted. Whisk in the lemon juice and salt and pepper to taste.
Pour the sauce evenly over the chicken and ham and top with the shredded Swiss cheese. Top with the panko mixture and bake for 30-35 minutes, until the casserole is bubbling and the bread crumbs are golden brown. Top with chopped parsley and hollandaise, if desired.