This oven baked 3-ingredient chicken cordon bleu casserole is the sort of practical little supper that has kept Midwestern kitchens running for generations: simple, hearty, and special enough for company without asking too much of the cook. It borrows the familiar flavors of classic chicken cordon bleu, but turns them into an easy casserole with tender chicken, savory ham, and plenty of Swiss cheese baked together until hot and bubbly. It is exactly the kind of recipe a neighbor like Helen would make year after year, because it feels festive on the table and still leaves you time to visit with family.
Serve this casserole with buttered egg noodles, fluffy rice, or mashed potatoes to catch all that rich cheesy goodness. A green vegetable like steamed broccoli, green beans, or a simple tossed salad helps balance the richness, and a basket of warm rolls makes it feel especially welcome on a holiday table or Sunday supper spread.
Oven Baked 3-Ingredient Chicken Cordon Bleu CasseroleServings: 6
4 cups cooked chicken, chopped or shredded
2 cups diced ham
8 ounces Swiss cheese, shredded or sliced into strips
1. Preheat your oven to 350°F and lightly grease a medium casserole dish.
2. Spread the chopped cooked chicken evenly in the bottom of the casserole dish.
3. Scatter the diced ham over the chicken in an even layer.
4. Top everything with the Swiss cheese, covering the casserole as evenly as you can.
5. Bake for 25 to 30 minutes, until the cheese is melted and the casserole is hot and bubbly around the edges.
6. Let it rest for 5 minutes before serving so the cheese settles just a bit and each spoonful comes out neatly.
Variations & TipsAdd a creamy touch: If you do not mind stepping beyond the strict three-ingredient version, a small spoonful of cream of chicken soup or a splash of milk stirred in can make the casserole softer and creamier, especially if your chicken is very lean.
Use leftover holiday meat: This is a fine place to use leftover baked ham and roasted chicken or turkey. Chop everything into bite-size pieces so each serving gets a little of both and the casserole heats evenly.
Choose your cheese carefully: Swiss gives this casserole its classic cordon bleu flavor, but if you prefer a milder taste, you can use baby Swiss. Be sure to shred or slice it thin so it melts smoothly across the top.
Do not overbake: Since the chicken and ham are already cooked, you are really just heating everything through and melting the cheese. Pull it from the oven once it is bubbling so the meat stays tender.
Make it a full meal: For a heartier supper, spoon this casserole over rice, toast, or buttered noodles. It stretches beautifully and turns a very simple dish into something that feels fit for a gathering.