This oven baked 3-ingredient chicken cordon bleu casserole is the kind of practical, comforting supper that earned a permanent place at potlucks, church dinners, and busy family tables. It takes the familiar flavors of chicken, ham, and Swiss cheese and turns them into a creamy, bubbly bake that feels special without asking much of the cook. When you need something warm, filling, and dependable, this old-fashioned casserole is a lovely one to keep in your back pocket.
Serve this casserole with simple sides that let the rich, savory flavors shine. Buttered egg noodles, fluffy rice, or mashed potatoes are all wonderful for soaking up the creamy sauce, and a crisp green salad or steamed green beans add a fresh balance. For a church supper or family gathering, I also like to set out soft dinner rolls and a fruit salad alongside it.
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 your oven to 350°F and lightly grease a medium baking dish.
2. Spread the chopped or shredded cooked chicken evenly in the prepared dish, then scatter the diced ham over the top.
3. Layer the Swiss cheese over the top so it covers the casserole as evenly as possible.
4. Bake uncovered for 25 to 30 minutes, until the cheese is fully melted and the casserole is hot and bubbly around the edges.
5. Let the casserole rest for 5 minutes before serving so the layers settle and scoop out neatly.
Variations & Tips
For a creamier casserole: If you want a more traditional creamy church-supper texture, stir in a can of condensed cream of chicken soup before baking. It stretches the dish nicely and makes it even more scoopable for a crowd.
For picky eaters: Dice everything fairly small so every bite is easy to eat and the ham does not feel too chunky. You can also use mild provolone in place of Swiss if your family prefers a gentler cheese flavor.
Make-ahead tip: Assemble the casserole earlier in the day, cover, and refrigerate until baking time. If it goes into the oven cold, add about 5 to 10 extra minutes so it heats all the way through.
Use what you have: Rotisserie chicken works beautifully here and saves time on busy evenings. Leftover baked ham from a holiday meal is also perfect, which is one reason this recipe has stayed popular for generations.