A creamy, cheesy gratin featuring tender chicken, ham, and Swiss cheese, inspired by the classic Cordon Bleu but baked as an easy casserole.
20 min prep
35 min cook
6 servings
580 kcal/serving
Ingredients
1.5 lbs boneless skinless chicken breasts, cut into 1-inch cubes
8 oz cooked ham, diced
2 tbsp unsalted butter
2 tbsp all-purpose flour
2 cups whole milk
1 cup heavy cream
1 tsp Dijon mustard
1/4 tsp ground nutmeg
Salt and black pepper to taste
8 oz Swiss cheese, shredded (about 2 cups)
1/2 cup panko breadcrumbs
2 tbsp grated Parmesan cheese
1 tbsp olive oil
Instructions
Preheat oven to 375°F. Grease a 9x13-inch baking dish.
In a large skillet over medium-high heat, cook chicken cubes until golden and cooked through, about 6-8 minutes. Season with salt and pepper. Transfer to a bowl and set aside.
In the same skillet, melt butter over medium heat. Whisk in flour and cook for 1 minute. Gradually whisk in milk and cream, stirring constantly until thickened, about 3-4 minutes. Remove from heat.
Stir in Dijon mustard, nutmeg, and 1.5 cups of Swiss cheese until melted. Season with salt and pepper.
Spread half of the sauce in the prepared baking dish. Top with cooked chicken and diced ham. Pour remaining sauce over the top and sprinkle with remaining 1/2 cup Swiss cheese.
In a small bowl, combine panko, Parmesan, and olive oil. Sprinkle evenly over the gratin.
Bake for 20-25 minutes until bubbly and golden brown. Let rest 5 minutes before serving.
Tips
For extra flavor, add a pinch of garlic powder or paprika to the sauce.
Serve with a side salad or steamed vegetables.
Leftovers can be refrigerated for up to 3 days; reheat in the oven or microwave.