Name: Creamy Chicken Tetrazzini Casserole Recipe
Prep time: 25 min
Cook time: 50 min
Total time: 1 h 15 min
Cuisine: American
Ingredients: 12 oz linguine (or spaghetti); 4 cups rotisserie chicken, shredded or diced (or cook 1.5 lbs chicken breast); 1 lb button mushrooms, thickly sliced; 1 medium onion, finely chopped; 4 garlic cloves, minced; 2 Tbsp olive oil; 4 Tbsp unsalted butter; 1/3 cup all-purpose flour; 3 cups low-sodium chicken broth; 1 Tbsp lemon juice; 2 cups half & half (or equal parts milk & heavy cream); 1 1/2 tsp sea salt (plus more to taste); 1/4 tsp freshly ground black pepper; 1/4 cup chopped parsley (plus more for garnish); 1 1/2 cups shredded mozzarella cheese

Jump to Recipe· 4.4 from 5 reviews

If comfort food had a name, it just might be this incredible Creamy Chicken Tetrazzini Casserole Recipe. Imagine tender shredded chicken swimming in a luscious, velvety sauce with sautéed mushrooms, golden onions, and perfectly cooked linguine, all baked until bubbling and topped with melty mozzarella. This dish brings cozy nostalgia and elegant flavor together in a way that’s perfect for family dinners or impressing guests without any fuss. It’s a hearty, soul-warming casserole that feels special but comes together with surprisingly simple ingredients and steps.

Ingredients You’ll Need

A woman's hand is placing a large bundle of uncooked long yellow spaghetti noodles into a shiny silver stainless steel pot filled with water on a gas stove burner. The pot has two handles and a lid resting next to it. The background shows part of the stove surface with black metal grates. The scene has a clean, simple kitchen look with a white marbled texture surface below. photo taken with an iphone --ar 4:5 --v 7

Every ingredient in this Creamy Chicken Tetrazzini Casserole Recipe plays a crucial role in delivering that perfect balance of taste, texture, and color. From the tender chicken providing protein and richness, to the mushrooms and onions creating depth and earthiness, and the creamy sauce binding everything together, these essentials ensure every bite is a delight.

12 oz linguine (or spaghetti): Choose a pasta that holds sauce well and cooks to just the right tender bite.
4 cups rotisserie chicken: Using pre-cooked chicken saves time while packing in savory flavor, or cook your own chicken breast for freshness.
2 Tbsp olive oil: For sautéing mushrooms and onions, adding subtle fruitiness and aiding caramelization.
1 lb button mushrooms: Thickly sliced for meaty texture and earthy undertones.
1 medium onion: Finely chopped to melt into sweetness that complements every other flavor.
4 garlic cloves: Minced to infuse a warm, aromatic base that brightens the entire dish.
4 Tbsp unsalted butter: Creates the rich roux for the sauce with a creamy, luscious mouthfeel.
1/3 cup all-purpose flour: The thickening agent that turns broth and cream into a velvety sauce.
3 cups low-sodium chicken broth: Adds savory depth without overpowering the creaminess.
1 Tbsp lemon juice: A splash of acidity to brighten and balance the richness perfectly.
2 cups half & half: The star of the sauce, offering creamy smoothness without heaviness.
1 1/2 tsp sea salt: Enhances all the natural flavors; adjust to taste.
1/4 tsp freshly ground black pepper: For subtle warmth and spice.
1/4 cup parsley: Chopped fresh parsley adds a pop of color and fresh herbaceous note.
1 1/2 cups shredded mozzarella cheese: Melts beautifully on top to form that irresistible golden crust.

How to Make Creamy Chicken Tetrazzini Casserole Recipe

Step 1: Prep and Cook Pasta

Start by bringing a large pot of salted water to a boil—the water should be salty enough to taste like the ocean! Cooking the linguine just until barely al dente is key so it won’t get mushy in the casserole. Reserve half a cup of the pasta cooking water before draining; this starchy water is a secret weapon to help loosen the sauce if needed later.

Step 2: Sauté Mushrooms, Onions, and Garlic

Heat olive oil in a large skillet over medium-high heat and add the sliced mushrooms, cooking until they soften and release their earthy aroma—about 3 minutes. Then stir in the finely chopped onions and cook until they are translucent and golden, about 5 to 7 minutes. Finally, toss in the minced garlic and sauté just until fragrant; be careful not to brown it. This trio forms the flavorful veggie base that truly elevates the casserole.

Step 3: Make the Creamy Sauce

Using the same pot you cooked pasta in, melt butter over medium heat and whisk in the flour until lightly golden to form a smooth roux. Slowly whisk in chicken broth, lemon juice, salt, and pepper, stirring continuously until the sauce thickens. Next, add the half and half and bring everything just to a gentle simmer. Taste and adjust seasoning, as this sauce is the soul of the dish—rich, creamy, and perfectly balanced.

Step 4: Combine the Ingredients in the Casserole

Return the chicken and sautéed mushroom-onion-garlic mixture to the pot with the creamy sauce, then add cooked linguine and the chopped parsley. Stir everything gently to combine so that every noodle is luxuriously coated. If the sauce looks a bit thick, stir in reserved pasta water a little at a time until you reach your desired sauciness. Spread this mixture evenly into a buttered 9×13 casserole dish and sprinkle the shredded mozzarella generously on top.

Step 5: Bake to Perfection

Cover the casserole with foil and bake in a preheated 350˚F oven for 20 minutes, allowing the flavors to meld and the cheese to melt. Remove the foil and continue baking for another 15 minutes to brown the top beautifully. If you want that extra golden touch, pop the casserole under the broiler for 1 to 2 minutes—just watch closely so it doesn’t burn. This final step turns an already delicious dish into a golden, bubbling masterpiece.

How to Serve Creamy Chicken Tetrazzini Casserole Recipe

The image shows a white rectangular baking dish filled with a baked pasta dish. The top layer is a thick, creamy white cheese sauce spread evenly, with small green parsley flakes sprinkled across it, adding contrast. Underneath, some of the pasta edges are visible, showing thin, slightly golden noodles mixed with small bits of mushrooms. The dish sits on a white marbled surface, and the edges of the baking dish softly curve upwards. Photo taken with an iphone --ar 4:5 --v 7

Garnishes

A sprinkle of fresh chopped parsley adds a vibrant pop of green that contrasts beautifully against the golden cheese crust and brings fresh brightness to every bite. You can also add a few cracked black peppercorns on top for a little extra bite and visual appeal. These simple garnishes make the dish feel as special as it tastes.

Side Dishes

This casserole is wonderfully filling on its own, but pairing it with a crisp green salad or some roasted seasonal vegetables can balance the richness and add fresh variety. Subtle sides like steamed asparagus, garlic bread, or even a bright tomato salad help round out a well-composed, satisfying meal.

Creative Ways to Present

For a fun twist, consider serving this Creamy Chicken Tetrazzini Casserole Recipe in individual ramekins or mini cast-iron skillets for personalized portions. This makes it perfect for dinner parties or cozy family dinners where everyone gets their own bubbling mini casserole. Pair each serving with a lemon wedge on the side for an extra zing that guests can squeeze over their portions.

Make Ahead and Storage

Storing Leftovers

Leftover Creamy Chicken Tetrazzini Casserole Recipe keeps beautifully covered in the refrigerator for up to 3 days. Store it in an airtight container to preserve moisture and prevent the cheese topping from drying out. When ready to enjoy again, simply reheat gently.

Freezing

This casserole freezes well, making it a perfect make-ahead comfort meal. To freeze, assemble the casserole but do not bake it. Wrap tightly with plastic wrap and aluminum foil, then freeze for up to 2 months. When ready to eat, bake it straight from the freezer, adding extra baking time until heated through and bubbly.

Reheating

To reheat, cover the casserole with foil and warm in a 350˚F oven until heated through, usually about 20-25 minutes. Avoid microwaving if possible, as the casserole reheats more evenly and retains its creamy texture when warmed slowly in the oven. For a crisp top, remove the foil in the last few minutes.

FAQs

Can I use a different type of pasta for this casserole?

Absolutely! While linguine is traditional, you can swap in spaghetti, fettuccine, or even penne for a different texture. Just be sure to cook the pasta al dente so it doesn’t become mushy during baking.

Is rotisserie chicken the best choice for this recipe?

Rotisserie chicken is fantastic because it’s already cooked and full of flavor, which speeds up prep time. However, you can always poach chicken breasts or use leftover cooked chicken; either will work wonderfully.

Can I make this recipe dairy-free or lower in fat?

For dairy-free options, substitute the butter with olive oil and use coconut milk or a plant-based cream alternative instead of half and half. Keep in mind that the texture will vary slightly, but the dish will still be delicious!

How do I know when the casserole is fully cooked?

Once the casserole is bubbly around the edges and the cheese topping is golden and slightly crisp, it’s ready. The internal temperature should be warm, and the sauce thick but not dry.

What can I add to make this casserole more flavorful?

Fresh herbs like thyme or sage can add wonderful complexity. You might also stir in a splash of white wine to the sauce or sprinkle some Parmesan cheese on top before baking for an extra savory touch.

Final Thoughts

There’s something truly special about the Creamy Chicken Tetrazzini Casserole Recipe that keeps me coming back to it again and again. It’s a dish that’s both indulgent and approachable, combining simple ingredients into something fantastic that warms the heart and pleases every palate. I can’t wait for you to try this recipe and make it part of your own family traditions—trust me, it’s a guaranteed crowd-pleaser!