An easy and elegant chicken casserole inspired by Ina Garten, featuring tender chicken, creamy sauce, veggies, and a golden, buttery breadcrumb topping. Perfect for cozy dinners or make-ahead meals.
4 cups cooked chicken, diced or shredded
1 medium onion, diced
2 celery stalks, chopped
4 tbsp butter
¼ cup all-purpose flour
2 cups chicken stock
½ cup heavy cream
1½ cups frozen peas and carrots
1 cup shredded Gruyère cheese
1 cup panko breadcrumbs
2 tbsp melted butter (for topping)
Salt and pepper to taste
1 tsp fresh thyme (optional)
Preheat oven to 375°F and butter a 9×13-inch baking dish.
In a large pan, melt 4 tbsp butter. Sauté onion and celery until soft.
Stir in flour to form a roux; cook 2 minutes.
Gradually whisk in chicken stock; simmer until thickened. Add cream, salt, pepper, and thyme.
Stir in cooked chicken, vegetables, and cheese. Mix well.
Pour into baking dish and smooth top.
In a bowl, mix panko with 2 tbsp melted butter and sprinkle over casserole.
Bake uncovered for 25–30 minutes, until bubbly and golden.
Rest 10 minutes before serving.
Add mushrooms or broccoli for variation.
Use turkey instead of chicken if desired.
Assemble a day ahead for easy weeknight baking.
Substitute white cheddar or Swiss for Gruyère.