Preheat the oven to 375°F (190°C) and lightly grease a 9×13-inch baking dish.
Spread the cooked chicken evenly in the bottom of the dish.
Layer the ham over the chicken, followed by the Swiss cheese.
In a bowl, whisk together the milk, broth, sour cream, soup, mustard, and seasonings until smooth.
Pour the sauce evenly over the layers.
Mix breadcrumbs, melted butter, and Parmesan cheese, then sprinkle the mixture on top.
Cover loosely with foil and bake for 20 minutes.
Remove the foil and bake another 15–20 minutes until bubbling and lightly browned.
Let the casserole rest for about 5–10 minutes before serving.
This short resting period helps the sauce settle and makes serving easier.
Practical Tips for Best Results
Small adjustments can improve the texture and flavor of this casserole.
Use evenly cut chicken
Uniform pieces help the casserole heat evenly and make serving easier.
Allow time to rest
Letting the casserole sit briefly after baking helps the sauce thicken slightly and keeps portions neat.
Balance the richness
This dish pairs well with lighter sides such as:
- Steamed green beans
- Roasted vegetables
- Fresh salad with vinaigrette
- Sliced fruit
These sides can help balance the creamy texture of the casserole.
Prepare ahead when possible
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