This oven baked 3-ingredient chicken cordon bleu casserole is the kind of practical comfort food that earned a permanent place on family holiday tables because it delivers familiar flavor with almost no fuss. Inspired by the classic combination of chicken, ham, and Swiss cheese, this simplified casserole turns those traditional cordon bleu flavors into an easy bake with a creamy, bubbling finish that feels nostalgic, rich, and especially welcome when you need something dependable.
Serve this casserole with buttered egg noodles, fluffy rice, or mashed potatoes to catch the creamy sauce, and add a green vegetable such as steamed broccoli, green beans, or a crisp salad for balance. If you are putting together a holiday-style meal, dinner rolls and a spoonful of cranberry sauce on the side make it feel especially homey.
Oven Baked 3-Ingredient Chicken Cordon Bleu Casserole
Servings: 6
Ingredients
4 cups cooked chicken, chopped or shredded
2 cups diced ham
8 ounces Swiss cheese, sliced or shredded
Directions
1. Preheat the oven to 350°F and lightly grease a medium baking dish or casserole dish.
2. Spread the chopped or shredded cooked chicken evenly in the prepared baking dish, then scatter the diced ham over the top.
3. Arrange the Swiss cheese evenly over the top so it covers most of the chicken and ham.
4. Bake uncovered for 25 to 30 minutes, or until the cheese is fully melted, bubbling around the edges, and lightly golden on top.
5. Let the casserole rest for 5 minutes before serving so the layers settle slightly and scoop out neatly.
Variations & Tips
Add a creamy binder: If you want a more traditional casserole texture, stir in 1 can of condensed cream of chicken soup before topping with the cheese. That turns the three ingredients into a slightly richer, saucier bake without changing the familiar flavor profile too much.
Use rotisserie chicken: Store-bought rotisserie chicken makes this especially convenient and adds extra savory flavor. Remove the skin, then chop or shred the meat so the casserole stays tender and easy to serve.
Try a breadcrumb topping: For a bit of crunch, scatter a small handful of buttered breadcrumbs over the cheese during the last 10 minutes of baking. It gives the casserole a more classic baked finish and a nice contrast to the soft interior.
Choose the right ham: Thick-cut leftover holiday ham works beautifully here because it stays meaty and distinct in the casserole. If using deli ham, fold or stack several slices before chopping so the pieces do not disappear into the dish.
Avoid overbaking: Since the chicken and ham are already cooked, the goal is simply to heat everything through and melt the cheese. Pull the casserole once it is hot and bubbly to keep the chicken from drying out.