Making Chicken Cordon Bleu with Swiss Cheese Sauce is easy if you follow these simple steps:

1. Preheat the Oven: Preheat your oven to 350°F (175°C) to prepare for baking.
2. Prepare Chicken: Place each chicken breast between two pieces of plastic wrap. Use a meat mallet to pound the chicken to about ½ inch thickness.
3. Season Chicken: Season both sides of the chicken breasts with salt, pepper, garlic powder, onion powder, and dried parsley.
4. Assemble: Lay one slice of ham and one slice of Swiss cheese on each chicken breast. Roll the chicken tightly, starting from the narrow end, and secure with toothpicks.
5. Prepare Breading Station: Set up a breading station with three shallow dishes: one with flour, one with beaten eggs, and one with breadcrumbs.
6. Bread the Chicken: Dredge each chicken roll in flour, dip it into the beaten eggs, and then coat it with breadcrumbs, ensuring an even layer.
7. Fry the Chicken: In a large skillet, melt the butter over medium heat. Add the chicken rolls and cook until golden brown on all sides, about 5-7 minutes.
8. Bake: Transfer the browned chicken rolls to a baking dish. Bake in the preheated oven for 20-25 minutes, or until the chicken is cooked through.
9. Make the Swiss Cheese Sauce: In a saucepan, melt 2 tablespoons of butter over medium heat. Whisk in the flour to create a roux and cook for 1-2 minutes. Gradually add the milk while whisking continuously until the mixture thickens.
10. Add Cheese: Stir in the shredded Swiss cheese, salt, pepper, and nutmeg (if using). Continue to stir until the cheese has melted and the sauce is smooth.
11. Serve: Once the chicken is done baking, remove it from the oven and let it rest for a few minutes. Remove toothpicks and slice the chicken rolls. Serve with the Swiss cheese sauce drizzled on top.