Name: Creamy Chicken Tetrazzini Casserole Recipe
Prep time: 20 min
Cook time: 55 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 of chicken breasts); 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 substitute with equal parts milk & heavy cream); 1 1/2 tsp sea salt (plus more to taste); 1/4 tsp black pepper, freshly ground; 1/4 cup parsley (chopped, plus more to garnish); 1 1/2 cups shredded mozzarella cheese

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If you’re looking for a comforting, rich, and utterly satisfying family dinner, this Creamy Chicken Tetrazzini Casserole Recipe will quickly become a go-to favorite. It brings together tender shredded chicken, perfectly cooked pasta, and a luscious creamy mushroom sauce that’s seasoned just right. Baked to bubbly perfection and topped with melty mozzarella cheese, this casserole delivers warm flavors and textures that feel like a big hug on a plate. Whether it’s a weeknight meal or a weekend gathering, this dish never disappoints.

Ingredients You'll Need

The image shows several ingredients laid out on a white marbled surface. There is a box of spaghetti on the left, next to a clear glass bowl with raw pale pink chicken pieces. Above the chicken, a brown cardboard container holds many small white mushrooms. To the right, a clear glass cup filled with pale yellow broth has a metal spoon inside. Nearby, a yellow onion and two garlic cloves are placed next to a small square of butter and a bunch of fresh green parsley. A bright orange measuring spoon filled with white salt rests beside half of a lemon, and a white plastic bottle of half and half cream sits near a clear bowl filled with shredded white cheese. Photo taken with an iphone --ar 4:5 --v 7

The beauty of this Creamy Chicken Tetrazzini Casserole Recipe lies in its simplicity—each ingredient plays a vital role in building those cozy layers of flavor and texture. From the tender chicken to the earthy mushrooms and creamy sauce, every component contributes to the magic happening in your casserole dish.

12 oz linguine (or spaghetti): Provides a tender, sturdy base that soaks up the creamy sauce beautifully.
4 cups rotisserie chicken (shredded or diced): Adds juicy, flavorful protein without extra fuss, but cooking your own chicken breast works great too.
2 tablespoon olive oil: Perfect for sautéing the mushrooms and onions, bringing out their natural sweetness.
1 lb button mushrooms (thickly sliced): Offers an earthy depth and meaty texture to complement the chicken.
1 medium onion (finely chopped): Adds a subtle sweetness and aromatic base.
4 garlic cloves (minced): Infuses the dish with a warm, fragrant punch.
4 tablespoon unsalted butter: Creates the rich, silky roux that thickens the sauce.
⅓ cup all-purpose flour: Essential for building that creamy sauce consistency.
3 cups low-sodium chicken broth: Brings savory, light body to the sauce.
1 tablespoon lemon juice: Brightens the sauce and balances the richness perfectly.
2 cups half & half (or milk and heavy cream): Adds creamy richness without overpowering the other flavors.
1 ½ teaspoon sea salt (plus more to taste): Enhances all the flavors harmoniously.
¼ teaspoon freshly ground black pepper: Adds a gentle kick and complexity.
¼ cup chopped parsley (plus more to garnish): Offers fresh herbaceous notes and a lovely pop of green.
1 ½ cups shredded mozzarella cheese: Melts over the casserole to create a golden, bubbly topping you’ll adore.

How to Make Creamy Chicken Tetrazzini Casserole Recipe

The image shows two stainless steel pans side by side on a stove, each filled with sliced brown mushrooms. In the left pan, a pile of white chopped onions is being added on top of mushrooms, creating two layers: the light tan mushrooms at the bottom and fresh white onions on top. In the right pan, a small pile of finely chopped pale yellow garlic is placed in the center of mushrooms, forming a mix of light brown mushrooms underneath and the finely chopped garlic at the middle. Both pans have a soft steam rising with a wooden spatula touching the mushrooms on the right. The background is a white marbled texture photo taken with an iphone --ar 4:5 --v 7

Step 1: Prepare the Pasta

Start by heating a large pot of salted water until it’s boiling. You want the water tasting like ocean water—that perfect saltiness ensures your pasta has great flavor from the start. Cook the linguine just until it is barely al dente, so it retains a firm bite once baked. Drain the pasta, reserving half a cup of the cooking water, then cover to keep it warm and prevent drying out while you work on the rest of the dish.

Step 2: Sauté Mushrooms, Onions, and Garlic

Heat olive oil in a large skillet over medium-high heat, then toss in the sliced mushrooms. Sauté until they soften and release their lovely earthy aroma, about 3 minutes. Add the finely chopped onions next, and cook them until they turn translucent and golden, which takes roughly 5 to 7 minutes. Finally, stir in the minced garlic and cook for another minute to awaken its fragrance without burning. Once done, combine this veggie mixture with the shredded chicken on your cutting board and set aside for now.

Step 3: Create the Creamy Sauce

Using the same pot you boiled the pasta in, melt the butter over medium heat. Whisk in the flour and cook until the mixture turns a light golden hue, about one and a half minutes—this forms the roux and ensures a silky sauce. Gradually pour in the chicken broth while whisking continuously to avoid lumps. Add the lemon juice, salt, and pepper to season. Then stir in the half & half and bring the sauce to a gentle simmer. Taste and adjust seasoning as needed for a perfectly balanced, rich flavor base.

Step 4: Combine Everything into the Casserole

Return the cooked pasta pot to the stove, then add the shredded chicken and mushroom mixture, fresh parsley, and the luscious sauce. Mix everything thoroughly to coat the pasta evenly. If you prefer your casserole extra saucy, stir in the reserved pasta water now. Transfer this creamy mixture into your buttered 9x13 casserole dish, smoothing it out so it bakes evenly. Finally, blanket the top with shredded mozzarella cheese for that irresistible golden melt.

Step 5: Bake to Perfection

Cover the casserole dish with foil and slide it into the preheated oven at 350˚F. Bake for 20 minutes to allow the flavors to meld and the sauce to thicken. Then remove the foil and continue baking uncovered for another 15 minutes so the cheese gets bubbly and golden. For an added bit of crispiness and color, broil the casserole for 1 to 2 minutes at the end—just watch carefully so it doesn’t burn.

How to Serve Creamy Chicken Tetrazzini Casserole Recipe

Garnishes

Finishing your Creamy Chicken Tetrazzini Casserole Recipe with freshly chopped parsley is a simple touch that lifts the dish with vibrant color and a subtle herbaceous kick. You can also sprinkle a pinch of grated Parmesan for an extra-savory burst or a dusting of crushed red pepper flakes if you like a little heat to contrast the creaminess.

Side Dishes

This rich casserole pairs beautifully with light, crisp side dishes to balance the meal. A refreshing mixed greens salad tossed with a tangy vinaigrette cuts through the richness, while steamed or roasted green vegetables like asparagus, broccoli, or green beans add color and crunch. Garlic bread or a warm crusty loaf is perfect for sopping up every luscious bit of sauce.

Creative Ways to Present

For a more elegant touch when entertaining, serve individual portions in small ramekins topped with fresh herbs. You can also layer the casserole in a clear glass baking dish to show off its creamy, cheesy layers, making it as lovely to look at as it is to eat. Leftover portions can be beautifully plated with a sprinkle of bright parsley and a wedge of lemon on the side for an additional burst of freshness.

Make Ahead and Storage

Storing Leftovers

This Creamy Chicken Tetrazzini Casserole Recipe holds up wonderfully in the fridge for up to 3 days. Store leftovers in an airtight container to maintain moisture and fresh flavors. When ready to enjoy, simply reheat on the stove top over low heat or in the microwave, stirring occasionally to ensure even warming.

Freezing

Want to make this casserole ahead of time? It freezes beautifully either before or after baking. To freeze before baking, cover the assembled casserole tightly with foil and plastic wrap. For cooked leftovers, portion them into freezer-safe containers. In either case, freeze for up to 3 months to enjoy later without sacrificing taste or texture.

Reheating

For the best results, thaw frozen portions overnight in the fridge. Reheat gently in the oven at 325˚F, covered with foil, until warmed through—about 20-30 minutes. Remove the foil in the final 5 minutes if you’d like to refresh the bubbly cheese topping. If using the microwave, heat in short intervals and stir to heat evenly without drying out.

FAQs

Can I use a different type of pasta?

Absolutely! While linguine or spaghetti works great for this Creamy Chicken Tetrazzini Casserole Recipe, you can swap in other pasta shapes like fettuccine, penne, or even egg noodles based on your preference or what you have on hand.

Is rotisserie chicken the best choice?

Rotisserie chicken is perfect because it’s flavorful and convenient, but if you prefer, you can cook fresh chicken breasts or thighs and shred them yourself. Just be sure to season and cook the chicken well for the best flavor.

Can I make this dish dairy-free or lighter?

Yes! To lighten up the casserole, substitute half & half with a combination of milk and a bit of light cream or use your favorite non-dairy milk with a thickener. Use dairy-free cheese if needed to keep that melty topping without dairy.

How do I prevent the pasta from getting mushy?

Cooking the pasta just until barely al dente is key—it’ll finish cooking in the oven with the sauce. Also, avoid over-mixing when combining ingredients and bake as instructed to maintain the perfect texture.

Can I add other vegetables?

Feel free to customize! Spinach, peas, or roasted red peppers are wonderful additions that complement the flavors of the Creamy Chicken Tetrazzini Casserole Recipe while adding color and nutrition.

Final Thoughts

This Creamy Chicken Tetrazzini Casserole Recipe is a heartwarming dish that combines ease, comfort, and deliciousness in every bite. It’s perfect for feeding a crowd or savoring cozy family dinners. I hope you’ll dive in and create this wonderful casserole yourself—it’s a true crowd pleaser that never goes out of style.

Ingredients You'll Need