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Creamy Chicken Tetrazzini combines tender shredded chicken, spaghetti, and sautéed mushrooms in a rich Parmesan cream sauce, all baked beneath a layer of golden, melted mozzarella. This comforting chicken pasta casserole gets its smooth, velvety texture from a homemade sauce made with butter, chicken broth, milk, and heavy cream. Every forkful brings together savory mushrooms, tender pasta, and plenty of cheesy goodness.
Using already-cooked chicken keeps preparation manageable, making this baked chicken tetrazzini a convenient option for family dinners. It’s also an excellent way to turn leftover chicken into a satisfying homemade meal.
Why This Creamy Chicken Tetrazzini Works
The secret to great chicken tetrazzini is balancing a creamy sauce with pasta that holds its texture during baking.
Cooking the spaghetti slightly under al dente prevents it from becoming overly soft in the oven. Meanwhile, sautéing the mushrooms until their moisture evaporates concentrates their savory flavor.
A simple butter-and-flour base thickens the sauce, while Parmesan adds a pleasantly salty, nutty flavor.
Finally, shredded mozzarella melts over the casserole, creating a lightly golden topping that contrasts beautifully with the creamy pasta underneath.
The result is a comforting chicken spaghetti casserole made with familiar ingredients and straightforward cooking techniques.
Ingredients You’ll Need
This homemade chicken tetrazzini recipe uses simple ingredients that work together to create its signature creamy texture.
Pasta, Chicken, and Mushrooms
Spaghetti: Twelve ounces of spaghetti form the base of the casserole. Cook it slightly under al dente because it continues softening during baking.
Cooked chicken: Four cups of chopped or shredded chicken provide the main protein. Leftover roasted chicken or rotisserie chicken works particularly well.
Mushrooms: Eight ounces of sliced mushrooms add earthy flavor and a pleasantly tender texture.
Homemade Cream Sauce
Unsalted butter: Creates a flavorful base for sautéing mushrooms and preparing the sauce.
Garlic: Three minced cloves contribute aromatic, savory flavor.
All-purpose flour: Thickens the sauce so it coats the spaghetti instead of pooling at the bottom.
Chicken broth: Adds savory depth while keeping the sauce from becoming excessively heavy.
Whole milk and heavy cream: Work together to create a smooth, rich consistency.
Parmesan cheese: Adds nutty, savory flavor directly to the sauce.
Mozzarella cheese: Melts into a soft, golden topping during baking.
Salt and black pepper: Balance and enhance the other ingredients.
How to Make Creamy Chicken Tetrazzini
This baked chicken tetrazzini comes together in a skillet before finishing in the oven.
Step 1: Prepare the Pasta
Preheat your oven to 375°F and lightly grease a 9×13-inch baking dish.
Cook the spaghetti according to its package directions, stopping 1–2 minutes before al dente.
Drain thoroughly and set aside.
Slightly undercooking the pasta helps it maintain its texture after absorbing some sauce in the oven.
Step 2: Cook the Mushrooms
Melt the butter in a large skillet over medium heat.
Add the sliced mushrooms and cook until lightly browned and their excess moisture evaporates.
Avoid rushing this step. Mushrooms release considerable liquid, and allowing it to cook away prevents a watery casserole.
Add the minced garlic and cook briefly until fragrant.
Step 3: Make the Creamy Parmesan Sauce
Sprinkle the flour over the mushrooms and stir continuously for approximately one minute.
Gradually whisk in the chicken broth, whole milk, and heavy cream.
Continue cooking at a gentle simmer until the sauce thickens slightly.
Stir in the grated Parmesan, salt, and black pepper.
The sauce should remain pourable because the pasta will absorb additional moisture during baking.
Step 4: Assemble the Casserole
Add the cooked chicken and drained spaghetti to the skillet.
Gently toss until everything is generously coated with the creamy mushroom sauce.
Transfer the mixture to your prepared baking dish, spreading it evenly.
Sprinkle the shredded mozzarella across the top.
Step 5: Bake Until Golden
Bake uncovered for 20–25 minutes, until the casserole is bubbling and the mozzarella becomes lightly golden.
Remove from the oven and rest for 5–10 minutes before serving.
This brief resting period allows the sauce to settle, making the casserole easier to portion.
Tips for the Best Chicken Tetrazzini
A few simple techniques make a noticeable difference in this creamy chicken pasta bake.
Don’t overcook the spaghetti. Pasta that starts too soft can become mushy during baking.
Brown the mushrooms properly. Cooking away their excess moisture gives the sauce better flavor and consistency.
Add liquids gradually. Slowly whisking broth, milk, and cream into the flour mixture helps prevent lumps.
Avoid an overly thick sauce. The sauce should coat the pasta generously before baking.
Use freshly grated Parmesan when possible. It generally incorporates more smoothly than some packaged grated varieties.
Let the casserole rest. Waiting several minutes before serving helps the creamy sauce settle around the pasta.
Easy Variations and Substitutions
This classic chicken tetrazzini is adaptable without requiring major changes to the preparation.
Rotisserie chicken is a convenient substitute for other cooked chicken. Remove the skin and bones before shredding.
For a different pasta shape, try fettuccine or linguine. Keep the total pasta weight at 12 ounces.
Cremini mushrooms can replace white button mushrooms for a slightly deeper, earthier flavor.
For a different cheese topping, try a combination of mozzarella and additional Parmesan. These are optional variations; the original recipe uses mozzarella alone.
What to Serve With Chicken Tetrazzini
Because creamy chicken tetrazzini is rich and filling, lighter side dishes provide a pleasant contrast.
A crisp green salad with a tangy vinaigrette balances the creamy Parmesan sauce.
Steamed broccoli, roasted asparagus, or sautéed green beans also work well.
For a heartier dinner, serve smaller portions alongside garlic bread and a simple salad.
Make-Ahead, Storage, and Reheating
To prepare ahead, assemble the casserole, cover, and refrigerate promptly. Bake within 24 hours, allowing additional oven time if needed to heat the center thoroughly.
Store leftovers in airtight containers in the refrigerator for 3–4 days, following the USDA’s leftover food safety recommendations.
Reheat individual portions in the microwave or warm larger portions covered in the oven.
A small splash of milk can help loosen sauce that thickens during refrigeration.
Reheated leftovers should reach 165°F.
You can also freeze cooled portions, although the cream sauce may separate slightly and the pasta can soften after thawing.
Frequently Asked Questions
Can I use rotisserie chicken for chicken tetrazzini?
Yes. Rotisserie chicken works beautifully because it’s already cooked and easy to shred. Measure four cups before adding it to the sauce.
Why is my chicken tetrazzini dry?
Overcooked pasta, an excessively thick sauce, or prolonged baking can produce a dry casserole. Keep the sauce slightly loose before baking and remove the dish once bubbling and lightly golden.
Can I make chicken tetrazzini without mushrooms?
Yes. You can omit the mushrooms, although the casserole will lose some of its earthy flavor. Prepare the remaining sauce ingredients as directed.
Can creamy chicken tetrazzini be frozen?
Yes, but freezing may affect the sauce’s smoothness. Cool leftovers promptly, freeze in airtight containers, and thaw safely in the refrigerator before reheating.
How do I know when chicken tetrazzini is done?
The casserole should be bubbling around the edges with lightly golden mozzarella. Because the chicken is already cooked, baking primarily heats the casserole and melts the cheese. For food safety, reheated or previously refrigerated portions should reach 165°F, as indicated by the USDA safe temperature chart.
PrintCreamy Chicken Tetrazzini
Creamy Chicken Tetrazzini combines tender cooked chicken, spaghetti, and sautéed mushrooms in a rich homemade Parmesan cream sauce. Finished with melted mozzarella and baked until bubbling and lightly golden, this comforting chicken pasta casserole makes a satisfying family dinner.
- Category: Dinner
- Method: Baking
- Cuisine: American
Ingredients
12 ounces spaghetti
4 cups chopped or shredded cooked chicken
8 ounces mushrooms, sliced
4 tablespoons unsalted butter
3 cloves garlic, minced
¼ cup all-purpose flour
2 cups chicken broth
1 cup whole milk
1 cup heavy cream
¾ cup grated Parmesan cheese
1½ cups shredded mozzarella cheese
¾ teaspoon salt, or to taste
¼ teaspoon black pepper
Instructions
1. Preheat the oven to 375°F and lightly grease a 9×13-inch baking dish.
2. Cook the spaghetti until 1–2 minutes shy of al dente, then drain.
3. Melt the butter in a large skillet. Add the mushrooms and cook until lightly browned and their excess moisture has evaporated.
4. Add the minced garlic and cook briefly until fragrant. Stir in the flour and cook for 1 minute.
5. Gradually whisk in the chicken broth, whole milk, and heavy cream. Simmer gently until slightly thickened.
6. Stir in the grated Parmesan, salt, and black pepper.
7. Add the cooked chicken and drained spaghetti. Gently toss until everything is generously coated with sauce.
8. Transfer the mixture to the prepared baking dish and spread evenly. Sprinkle the shredded mozzarella over the top.
9. Bake uncovered for 20–25 minutes, until bubbling and lightly golden.
10. Remove from the oven and rest for 5–10 minutes before serving.
Notes
Cook the spaghetti 1–2 minutes shy of al dente to prevent overly soft pasta after baking.
Rotisserie chicken or leftover roasted chicken can be used.
Cook the mushrooms until their released moisture evaporates to prevent a watery casserole.
Keep the cream sauce slightly loose before combining it with the spaghetti because the pasta absorbs moisture during baking.
Freshly grated Parmesan generally melts more smoothly into the sauce.
Allow the casserole to rest for 5–10 minutes before serving.
Refrigerate leftovers promptly in airtight containers for 3–4 days.
Reheat leftovers to an internal temperature of 165°F.
A splash of milk can help loosen the sauce during reheating.
Freezing is possible, although the cream sauce may separate slightly and the pasta may soften after thawing.