Easy Creamy Chicken Tetrazzini (Irresistible, 65 Min)

Some nights call for a dish that reheats well, feeds a crowd, and doesn’t ask much of you in return. Chicken tetrazzini has been that dish in my kitchen for years, the kind of casserole I make on a Sunday knowing I’ll be grateful for the leftovers by Wednesday. It’s creamy without being heavy, and the golden, slightly crisp top layer is honestly half the reason I keep making it.

This version uses a simple butter-and-flour sauce built right in the same pan the mushrooms were cooked in, so there’s less to clean and more flavor left behind from every step.

Why You’ll Love This Chicken Tetrazzini

• Uses rotisserie chicken. No extra pot to cook chicken in if you grab a rotisserie bird from the store.
• One creamy sauce, built in layers. Cooking the mushrooms first, then building the sauce in the same pan, means the sauce picks up their flavor instead of tasting flat.
• Freezes well before or after baking. This makes it a genuinely useful make-ahead dinner, not just a same-night meal.
• Feeds a crowd from pantry staples. Beyond the chicken and mushrooms, most of this comes together from ingredients already in a well-stocked kitchen.
• That golden, slightly crisp top. A light breadcrumb and Parmesan topping gives texture contrast against the creamy pasta underneath.

Recipe Snapshot

• Servings: 8 servings
• Difficulty: Easy
• Cuisine/Course: Italian-American, Main Dish / Casserole
• Prep Time: 20 minutes
• Cook Time: 45 minutes
• Total Time: 65 minutes

What is chicken tetrazzini made of? Chicken tetrazzini is a baked pasta casserole made from cooked spaghetti, shredded chicken, and sautéed mushrooms tossed in a creamy butter-and-broth sauce, then topped with Parmesan and breadcrumbs and baked until golden.

Ingredients

For the Pasta and Chicken

• 12 oz (340 g) spaghetti, broken in half
• 3 cups (about 420 g) shredded cooked chicken (rotisserie chicken works well and saves time)

For the Sauce

• 4 tbsp (55 g) unsalted butter
• 8 oz (225 g) sliced cremini or button mushrooms
• 1 small yellow onion, finely diced
• 2 garlic cloves, minced
• 1/3 cup (40 g) all-purpose flour (thickens the sauce; a 1:1 gluten-free flour blend works as a substitute)
• 2 1/2 cups (600 ml) chicken broth
• 1 cup (240 ml) heavy cream (adds richness; whole milk can be used for a lighter sauce, though it will be thinner)
• 1/4 cup (60 ml) dry sherry, optional (adds depth; substitute with an extra 1/4 cup chicken broth plus a small squeeze of lemon juice for an alcohol-free version)
• 1/2 cup (50 g) grated Parmesan cheese
• 1/2 tsp salt, plus more to taste
• 1/4 tsp black pepper
• 1/4 tsp ground nutmeg (a classic tetrazzini touch that rounds out the cream sauce)

For the Topping

• 1/2 cup (25 g) panko breadcrumbs
• 1/4 cup (25 g) grated Parmesan cheese
• 1 tbsp melted butter

Recipe Timing

• Prep Time: 20 minutes
• Cook Time: 45 minutes
• Rest Time: none required
• Total Time: 65 minutes

Equipment

• Large oven-safe skillet or a 9×13-inch baking dish (an oven-safe skillet lets you build the sauce and bake in the same pan, saving on dishes)
• Meat thermometer, if starting from raw chicken instead of rotisserie (confirms the chicken reaches a safe internal temperature)

Before You Start

• Bring a large pot of salted water to a boil for the pasta before you start the sauce, so both finish around the same time.
• Shred your chicken ahead of time if using rotisserie chicken, so it’s ready to fold in.
• Preheat your oven to 375°F (190°C).
• If starting from raw chicken breasts, poach or bake them first and confirm they reach an internal temperature of 165°F (74°C) before shredding.

How to Make Chicken Tetrazzini

Preparing the Pasta

1. Cook the spaghetti in salted boiling water until just shy of al dente, about 1 to 2 minutes less than the package directs, since it will finish cooking in the oven.
2. Drain the pasta and set aside, reserving 1/2 cup of the pasta water in case the sauce needs thinning later.

Food safety note: if you’re cooking raw chicken for this recipe rather than using rotisserie chicken, wash your hands, cutting board, and any utensils that touched raw chicken with hot, soapy water before they touch any other ingredient.

Building the Sauce

3. In a large oven-safe skillet, melt the butter over medium heat. Add the mushrooms and onion, and cook for 6 to 8 minutes, stirring occasionally, until the mushrooms release their liquid and it evaporates.
4. Add the garlic and cook for 30 seconds, just until fragrant.
5. Sprinkle the flour over the mushroom mixture and stir constantly for 1 minute to cook off the raw flour taste. Why this works: cooking the flour briefly in the butter before adding liquid prevents a raw, pasty flavor in the finished sauce.
6. Slowly whisk in the chicken broth, a little at a time, to avoid lumps, then whisk in the cream and sherry (if using).
7. Bring the sauce to a gentle simmer and cook for 4 to 5 minutes, stirring often, until thickened enough to coat the back of a spoon.
8. Stir in the Parmesan, salt, pepper, and nutmeg until the cheese melts smoothly. Why this works: adding cheese off the direct heat’s most intense point and stirring continuously helps it melt into the sauce instead of clumping or turning grainy.

💡 Quick Tip: If your sauce looks too thick before baking, loosen it with a splash of the reserved pasta water. It will thicken further in the oven.

Assembling and Baking

9. Fold the cooked spaghetti and shredded chicken into the sauce until everything is evenly coated. If not using an oven-safe skillet, transfer the mixture to a greased 9×13-inch baking dish now.
10. In a small bowl, mix the panko, Parmesan, and melted butter, then scatter evenly over the top.
11. Bake at 375°F (190°C) for 20 to 25 minutes, until the sauce is bubbling at the edges and the topping is golden brown.
12. Let the dish rest for 5 minutes before serving so the sauce can settle slightly.

Common Mistakes and Troubleshooting

Problem: The sauce turns out lumpy. Why: The broth was added too quickly to the flour-butter mixture, so the flour didn’t have time to hydrate evenly. Fix: Add the broth gradually, whisking constantly, and use a whisk rather than a spoon for this step.

Problem: The finished casserole is watery instead of creamy. Why: The mushrooms weren’t cooked long enough beforehand to release and evaporate their moisture. Fix: Cook the mushrooms until you can see the pan is dry again before adding the flour.

Problem: The pasta turns mushy after baking. Why: The spaghetti was cooked fully before baking, so it overcooked further in the oven. Fix: Undercook the pasta slightly on the stovetop, since it continues cooking in the sauce.

Variations and Substitutions

• Turkey tetrazzini: Swap the chicken for shredded leftover turkey, a natural post-holiday use for extra turkey.
• Add peas: Stir in 1 cup of frozen peas along with the pasta for a pop of color and sweetness.
• Lighter version: Use whole milk instead of heavy cream and reduce the butter slightly; the sauce will be thinner but still flavorful.
• No alcohol: Skip the sherry entirely and replace it with the extra broth and lemon juice noted in the ingredient list.

Allergen Information

Contains: wheat/gluten, dairy.

• For a gluten-free version, use gluten-free spaghetti and substitute the flour with a 1:1 gluten-free baking blend, and use gluten-free breadcrumbs for the topping.
• For a dairy-free version, substitute the butter with a plant-based alternative, the cream with a full-fat coconut or oat-based cooking cream, and use a dairy-free Parmesan alternative.
• This recipe does not contain egg, nuts, soy, or shellfish as written. This information reflects the recipe as written and does not guarantee safety for your specific dietary needs or kitchen environment.

What to Serve With Chicken Tetrazzini

• A simple green salad with a light vinaigrette to balance the richness
• Garlic bread or crusty bread for scooping up extra sauce
• Steamed green beans or roasted broccoli
• A glass of dry white wine, if serving for a dinner gathering

Storage, Reheating, Freezing, and Make-Ahead

• Refrigerator: Store leftovers in an airtight container for up to 4 days.
• Reheating: Warm individual portions in the microwave, or reheat the whole dish covered in a 350°F (175°C) oven for about 20 minutes, adding a splash of broth or cream if it looks dry.
• Freezer: This casserole freezes well either before or after baking. Wrap tightly and freeze for up to 3 months; thaw overnight in the refrigerator before baking or reheating.
• Make-ahead: Assemble the casserole up to a day in advance, cover, and refrigerate unbaked, then add the breadcrumb topping and bake just before serving.
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Nutrition Information (Per Serving, Based on 8 Servings)

• Calories: 470
• Protein: 28 g
• Carbohydrates: 38 g
• Fat: 22 g
• Fiber: 2 g
• Sugar: 3 g
• Sodium: 620 mg

Values are approximate and may vary based on exact ingredients and brands used.

Frequently Asked Questions

Can I make chicken tetrazzini ahead of time? Yes, you can assemble the full casserole up to a day ahead, cover it, and refrigerate it unbaked. Add the breadcrumb topping right before it goes into the oven so it stays crisp.

Why did my sauce turn out grainy instead of smooth? A grainy sauce usually means the Parmesan was added over very high heat or melted in too quickly. Stir the cheese in gradually once the sauce has come off the highest heat.

Can I use a different pasta instead of spaghetti? Yes, linguine, fettuccine, or even egg noodles all work well; just keep the cook time slightly under package directions since the pasta finishes baking in the sauce.

How do I know the chicken is fully cooked if I’m not using rotisserie chicken? If cooking raw chicken breasts for this recipe, they’re done when a meat thermometer inserted into the thickest part reads 165°F (74°C).

Is chicken tetrazzini safe to make for someone with a dairy allergy? The recipe as written contains dairy in the butter, cream, and Parmesan, so it isn’t safe for a dairy allergy without substitution. Dairy-free swaps are listed above, but always check your specific ingredient brands rather than relying on a recipe alone.

Can I freeze chicken tetrazzini after it’s already baked? Yes, baked leftovers freeze well. Cool completely, portion into airtight containers, and freeze for up to 3 months, then reheat from frozen or thawed in the oven.

If you make this one, I’d genuinely love to know how it turned out. Leaving a star rating or a quick comment below helps other home cooks find this recipe.

Final Thoughts

Chicken tetrazzini earns its place in a regular dinner rotation because it does a lot with very little fuss: one pan, pantry staples, and leftovers that taste just as good the next day. Once the base technique clicks, whether it’s the mushroom sauce or the crisp breadcrumb top that wins you over, this is a casserole worth keeping in the back pocket for busy weeks.

Easy Chicken Tetrazzini Your Whole Family Will Ask For Again (65 Min)

A creamy baked pasta casserole with shredded chicken, sautéed mushrooms, and a golden Parmesan breadcrumb topping, ready in about 65 minutes.

Print Recipe Pin Recipe

Prep Time 20 minutes mins

Cook Time 45 minutes mins

Total Time 1 hour hr 5 minutes mins

Servings: 8 servings

Course: Main Dish

Cuisine: Italian-American

Calories: 470

Ingredients Equipment Method Notes

Ingredients

  

• For the Pasta and Chicken
• 12 oz spaghetti broken in half
• 3 cups shredded cooked chicken rotisserie chicken works well
• For the Sauce
• 4 tbsp unsalted butter
• 8 oz sliced cremini or button mushrooms
• 1 small yellow onion diced
• 2 cloves garlic minced
• ⅓ cup all-purpose flour GF blend works as substitute
• 2½ cups chicken broth
• 1 cup heavy cream whole milk for a lighter sauce
• ¼ cup dry sherry optional; see notes for alcohol-free swap
• ½ cup grated Parmesan cheese
• ½ tsp salt plus more to taste
• ¼ tsp black pepper
• ¼ tsp ground nutmeg
• For the Topping
• ½ cup panko breadcrumbs
• ¼ cup grated Parmesan cheese
• 1 tbsp melted butter

Equipment

• 1 Large oven-safe skillet or 9×13-inch baking dish Skillet saves on dishes; baking dish works fine too1
• 1 Meat thermometer Only needed if starting from raw chicken

Method

 

1. Preparing the Pasta
2. Cook spaghetti until just shy of al dente; drain and reserve 1/2 cup pasta water.
3. Building the Sauce 2. Melt butter, cook mushrooms and onion 6 to 8 minutes until liquid evaporates. 3. Add garlic, cook 30 seconds. 4. Stir in flour, cook 1 minute. 5. Whisk in broth gradually, then cream and sherry. 6. Simmer 4 to 5 minutes until thickened. 7. Stir in Parmesan, salt, pepper, and nutmeg until melted smooth.
4. Assembling and Baking 8. Fold in pasta and chicken; transfer to baking dish if needed. 9. Top with panko, Parmesan, and melted butter mixture. 10. Bake at 375°F (190°C) for 20 to 25 minutes until golden and bubbling. 11. Rest 5 minutes before serving.
5. Nutrition (per serving): Calories: 470 | Protein: 28 g | Carbohydrates: 38 g | Fat: 22 g | Fiber: 2 g | Sugar: 3 g | Sodium: 620 mg
If the sauce looks too thick before baking, loosen it with a splash of reserved pasta water.

Notes

Contains wheat and dairy; gluten-free and dairy-free swaps are included in the post. Optional sherry has an alcohol-free substitute listed in the ingredients. Freezes well before or after baking.