Thin spaghetti, four cups of chicken, and a creamy sour-cream sauce under melted mozzarella — one 13×9, forty minutes in the oven, and the pan comes back empty.
Three things that keep it creamy, not mushy
The whole recipe is one bowl and one pan, and these are the three places it goes right or wrong.
- Cook the pasta al dente: It bakes another forty minutes in the sauce, so soft noodles going in come out mush.
- Use cooked chicken: Four cups of shredded chicken you already made, and the hard part is done.
- Hold the Panko: It goes on after the first thirty minutes, so it toasts for the last ten instead of soaking.
This chicken tetrazzini casserole is one of my favorite meals to take to a family with a new baby – everyone loves it and it’s always a big hit!
It is the dinner I show up with when someone has a newborn and no free hands. It reheats well, the flavors are mild enough that every kid at the table eats it, and the pan comes back empty.
Need an easy chicken casserole dinner that can be made ahead? This is it!
This chicken tetrazzini is simple, yet full of flavor and every single person (kids and adults alike!) that eats it loves it.
Easy Chicken Tetrazzini Dinner Casserole:
- 16 oz thin spaghetti cooked
- ½ cup butter plus more for buttering pan
- 4 cups chicken cooked and shredded
- 2 cans cream of chicken soup
- 2 cups sour cream
- ½ cup milk
- 1 tsp salt
- 1/2 tsp ground black pepper
- 2 T parmesan cheese
- 2 cups shredded mozzarella cheese
- ½ to 1 cup Panko bread crumbs
Directions to make this Chicken Tetrazzini:
- Combine butter, cooked & shredded chicken, soup, sour cream, salt, pepper, parmesan cheese and milk. Add cooked noodles.
- Pour into a sprayed/greased 13×9 casserole dish. Sprinkle mozzarella cheese on top.
- Bake in a 350 degree oven for 30 minutes
- Top with Panko bread crumbs, bake ten minutes more.
What Makes the Sauce Work
The sauce is butter, cream of chicken soup, sour cream, milk, and parmesan all stirred together. No roux, no whisking on the stove, nothing to break or curdle.
The sour cream is what makes it taste like more than a can of soup. Two full cups give the sauce a tang that keeps all that creaminess from feeling heavy.
What I Have Learned Making This
Cook the spaghetti al dente and stop there. It bakes another forty minutes in the sauce, and softer noodles turn to mush.
Use chicken you already cooked. Four cups sounds like a lot, but it is the difference between a pasta bake with some chicken in it and a real dinner.
Do not add the Panko at the start. It goes on top after the first thirty minutes, so it toasts for the last ten instead of soaking up sauce the whole bake.
Making It Ahead
This is a true make-ahead dinner. Assemble the whole casserole, cover it with foil, and it can wait in the refridgerator for up to two days before you bake it.
A cold casserole straight from the fridge needs a little longer in the oven. Add ten to twenty minutes to the bake time and check that the middle is hot.
Why does the Panko go on at the end?
Bread crumbs added at the start absorb the sauce and never crisp. Adding them for only the last ten minutes gives you a golden, crunchy top over a creamy middle.
Can I make chicken tetrazzini for someone else?
This is my go-to meal for a family with a new baby, and it travels well. Assemble it, cover it with foil, and hand it over with the baking directions – 350 degrees, thirty minutes, then Panko on top for ten more.
A Closer Look at the Ingredients
Thin spaghetti
A full sixteen ounce box of thin spaghetti is the base. Thin spaghetti cooks faster than regular and tangles into the sauce better, which is why I use it here.
Cook it al dente, then drain it well. Water left on the noodles thins the sauce and makes the bottom of the pan soupy.
The chicken
Four cups of cooked, shredded chicken is about a whole rotisserie chicken or four breasts. It is more chicken than most pasta bakes use, and that is on purpose.
I usually pull it from shredded chicken made in the crock pot earlier in the week, which turns this into a fifteen minute assembly job.
Cream of chicken soup
Two cans of cream of chicken are the body of the sauce. They bring thickness and salt, so there is no roux and no stove time.
Sour cream
Two cups of sour cream is what separates this from every other cream of chicken casserole. It adds a tang that keeps the sauce from tasting flat.
Full fat sour cream holds up best in the oven. Light sour cream works but the sauce comes out a little thinner.
Butter and milk
A half cup of softened butter melts into the warm noodles and makes the sauce silky. The half cup of milk loosens everything so it stirs together easily.
Parmesan and mozzarella
Two tablespoons of parmesan go into the sauce for flavor. Two cups of mozzarella go on top for the melted, stretchy layer the kids fight over.
Panko
A half cup to a cup of Panko bread crumbs goes on for the last ten minutes only. Panko stays crisper than regular bread crumbs because the flakes are bigger and drier.
Step by Step, With the Details
Cook the pasta first
Start the pasta water before anything else. Salt it well, cook the thin spaghetti one minute short of the box time, and drain it.
Mix the sauce in a big bowl
In your largest bowl, stir together the butter, chicken, both cans of soup, the sour cream, milk, salt, pepper, and parmesan. It should be thick and creamy.
Use a bigger bowl than you think you need. A full pound of spaghetti is about to go in, and you want room to fold without flinging sauce.
Fold in the noodles
Add the drained spaghetti while it is still warm and fold with tongs until every strand is coated. Warm noodles melt the butter and take the sauce better.
Into the pan, cheese on top
Spread it into a greased thirteen by nine dish and level the top. Scatter the mozzarella evenly so it melts into one layer instead of patches.
Thirty minutes, then Panko for ten
Bake uncovered at 350 for thirty minutes until the cheese is melted and the edges bubble. Sprinkle the Panko over the top and bake ten minutes more.
The Panko should be golden, not brown. If your oven runs hot, check it at the eight minute mark.
Easy Swaps
Turkey instead of chicken
Tetrazzini was originally a turkey dish, and four cups of leftover Thanksgiving turkey works exactly the same way. This is what happens to our turkey every November.
Mushrooms
The classic version has mushrooms. A cup of sliced mushrooms cooked in a little butter until they give up their liquid can go in with the chicken.
Peas
A cup of frozen peas stirred in with the noodles adds color and a vegetable without any extra cooking. They thaw in the oven.
Different cheese
Monterey jack or a mozzarella and provolone blend melt the same way. Cheddar works but gives a sharper flavor that fights the sour cream a little.
Feeding a Crowd
This makes eight good servings, which is why it is my potluck and new baby casserole. One pan feeds a family for two nights.
To feed more, make two pans rather than one deeper dish. Deep casseroles take much longer to heat through and the Panko timing gets thrown off.
Leftovers, Reheating and Freezing
In the refrigerator
Leftovers keep covered for three to four days. The Panko softens overnight, but the casserole itself reheats well.
Reheating
Reheat single servings in the microwave with a splash of milk. For a whole pan, cover with foil and warm at 325 for twenty five to thirty minutes.
Freezing
Assemble it in a foil pan without the Panko, wrap it twice, and freeze for up to three months. Thaw overnight in the fridge and bake as written, adding fifteen minutes.
Questions I Get About This Casserole
Can I use regular spaghetti?
Yes. Regular spaghetti, linguine, or even egg noodles work in the same amount. Cook any of them a minute short of al dente.
Is this the same as chicken spaghetti?
They are cousins. My chicken spaghetti casserole uses a homemade white sauce and colby jack. This one uses a sour cream sauce, mozzarella, and a Panko top.
Can I skip the sour cream?
Plain Greek yogurt is the closest swap and works cup for cup. Leaving it out entirely makes the sauce heavy and one note, so I would not.
Why did mine come out dry?
Usually the pasta was overcooked or drained too long before it went in. Pull it early, keep a splash of pasta water, and the sauce stays creamy.
Can I use rotisserie chicken?
Rotisserie chicken is the easiest way to get four cups. One average bird gets you there once the skin and bones are off.
More Easy Chicken Casseroles
- Cheesy Chicken Spaghetti
- Angel Chicken Rice Casserole
- No Peek Chicken Casserole
- Chicken Pot Pie Casserole
- Crockpot Chicken Alfredo
This is not a fussy dinner and that is the point. It is a big, warm pan of creamy pasta that picky eaters actually finish, whether it lands on your table or somebody else’s.
Chicken Tetrazzini
Ingredients
- 16 oz thin spaghetti cooked al dente
- ½ cup butter plus more for buttering pan
- 4 cups chicken cooked and shredded
- 2 cans cream of chicken soup
- 2 cups sour cream
- ½ cup milk
- 1 tsp salt
- 1/2 tsp ground black pepper
- 2 T parmesan cheese
- 2 cups shredded mozzarella cheese
- ½ to 1 cup Panko bread crumbs
Instructions
- Combine butter, cooked & shredded chicken, soup, sour cream, salt, pepper, parmesan cheese and milk. Add cooked noodles.
- Pour into a sprayed/greased 13x9 casserole dish. Sprinkle mozzarella cheese on top.
- Bake in a 350 degree oven for 30 minutes
- Top with Panko bread crumbs, bake ten minutes more.