This is my kind of weeknight comfort: creamy, cheesy pasta with tender chicken and mushrooms baked until bubbly. It feels special enough for guests but simple enough to throw together on a busy evening. The three cheeses—cream cheese folded into the sauce, freshly grated Parmesan, and melty mozzarella on top—give the dish layers of flavor and texture.

I like to prep a little while the pasta is cooking so nothing feels rushed. The recipe is straightforward: sauté, simmer a quick cream-cheese sauce, toss everything together, top with the cheeses, and bake. It’s forgiving, which is why I turn to it when I want something reliable that still gets compliments.

Below you’ll find the exact ingredient lineup and a step-by-step method that follows the tested directions. I also include practical tips for avoiding a gluey sauce, equipment that makes the process smoother, variations for different seasons, and answers to common questions so you can make this confidently.

The Ingredient Lineup

12 ounces uncooked spaghetti — The pasta base; cooks slightly under al dente so it finishes in the oven without getting mushy.
1 tablespoon olive oil — For sautéing the onion and starting the browning; adds a bit of fruitiness and helps prevent sticking.
3 tablespoons butter, divided — Use divided to control browning: part with the oil for the onions, part later for mushrooms and sauce richness.
1/2 medium onion, chopped — Builds savory sweetness; chop fairly small so it softens and blends into the sauce.
2 uncooked chicken breasts, cut into 1″ pieces — The protein; cutting into 1″ pieces helps them cook quickly and distribute through the pasta.
Salt & pepper to taste — Essential for seasoning the chicken, sauce, and finished dish; season throughout for the best flavor.
4 cloves garlic, minced — Adds aromatic depth; add with mushrooms so the garlic doesn’t burn but infuses the sauce.
1/4 teaspoon Italian seasoning — A small amount gives a subtle herb note without overpowering the cheeses.
7 ounces cremini or white mushrooms, sliced — Earthy and juicy; mushrooms add texture and soak up the sauce.
3/4 cup chicken broth — Thins and flavors the cream sauce; choose low-sodium if you want tighter control over salt.
1 cup heavy/whipping cream — Creates a rich, silky sauce when combined with the cream cheese.
8 ounces cream cheese (a block of Philly), softened — The anchor of the sauce; softening it first ensures it melts smoothly into the cream.
1 cup freshly grated Parmesan cheese — Sprinkled on top before baking for nutty, salty flavor and a gratin-like finish.
1 cup shredded mozzarella cheese — Melts into that gooey, pull-apart layer everyone loves; use whole-milk mozzarella for best melt.

Method: Three Cheese Chicken Tetrazzini

Preheat oven to 350°F and move the oven rack to the top third. Soften the cream cheese by microwaving it 20–30 seconds or leaving it at room temperature. Chop the 1/2 medium onion, mince the garlic, slice the mushrooms, and cut the 2 chicken breasts into 1″ pieces; season the chicken with salt and pepper to taste.
Bring a large pot of salted water to a boil for the spaghetti.
Cook the 12 ounces uncooked spaghetti until about 2 minutes less than the package time (slightly under al dente). Drain the pasta and set it aside.
While the pasta cooks (or immediately after), heat 1 tablespoon olive oil and 1 tablespoon of the butter in a large pot or deep skillet over medium-high heat.
Add the chopped onion and sauté 4–5 minutes, until the onion is lightly browned.
Add the seasoned chicken pieces to the pot and cook 5–6 minutes, until the chicken is almost cooked through. Transfer the chicken to a plate, leaving any onions in the pot.
Add the 4 cloves minced garlic, the remaining 2 tablespoons butter, and the 1/4 teaspoon Italian seasoning, then add the 7 ounces sliced mushrooms. Cook about 5 minutes, stirring occasionally, until the mushrooms release their liquid and most of it has evaporated.
Increase the heat to high and add 3/4 cup chicken broth, 1 cup heavy cream, and the softened 8 ounces cream cheese (cut into smaller pieces). Stir nearly constantly for about 3–5 minutes until the cream cheese melts and the sauce becomes smooth and slightly thickened. Avoid cooking longer than needed to prevent the sauce from becoming too thick.
Turn off the heat. Return the cooked chicken to the pot and add the drained spaghetti. Stir well so the pasta and chicken are evenly coated with the sauce.
Transfer the mixture to a 9×13-inch baking dish and spread it into an even layer. Sprinkle 1 cup freshly grated Parmesan evenly over the top, then sprinkle 1 cup shredded mozzarella over the Parmesan.
Bake uncovered at 350°F for 30 minutes. After 30 minutes, broil for a few minutes until the top is browned to your liking—watch carefully to avoid burning.
Remove from the oven and let the dish rest about 5 minutes before serving. Use a spatula to cut and serve so each portion has melted cheese on top.

Why This Three Cheese Chicken Tetrazzini Stands Out

This version balances richness and texture. The cream cheese gives immediate body and silkiness to the sauce without needing a flour roux, while the heavy cream keeps the mouthfeel luxurious. Freshly grated Parmesan adds sharp, salty brightness and helps form that golden crust, and mozzarella delivers the satisfying meltiness on top.

Cooking the spaghetti slightly under al dente means it absorbs a little of the sauce while baking and never goes soggy. Cutting the chicken into 1-inch pieces distributes protein through the dish so every forkful has a bit of everything. The mushrooms bring earthiness and moisture that lift the dish beyond being simply “cheesy pasta.”

International Equivalents

There isn’t a one-to-one traditional equivalent for this exact American casserole outside of regional pasta bakes, but similar concepts exist worldwide:

Italy: Baked pasta dishes like pasta al forno share the idea of pasta mixed with sauce and cheese, though they often use tomato-based sauces or béchamel rather than cream cheese.
France: Gratins embrace the same technique—assembling components and finishing under the broiler for a browned top—though French versions may rely more on béchamel and gruyère.
United Kingdom/Europe: Casseroles and shepherd’s pie-style bakes are similar in spirit: cooked filling under a starchy or cheesy top, meant to be hearty and shareable.

Tools & Equipment Needed

Large pot for boiling spaghetti — big enough so pasta cooks evenly and you can drain without splashing.
Large pot or deep skillet (with lid optional) — for sautéing onions, searing chicken, and making the sauce; using the same vessel saves time and dishes.
9×13-inch baking dish — the recipe’s volume is sized for this pan for even baking.
Colander — to drain the pasta.
Measuring cups and spoons — for the broth, cream, and seasonings.
Microwave or countertop space to soften cream cheese — room temperature works too if you have time.
Oven with broil setting — to brown the top at the end for that classic baked finish.

Problems & Prevention

Common mistakes are easy to avoid when you know what to watch for.

Problem: Sauce becomes too thick or grainy. Prevention: Soften the cream cheese fully and stir it into warm—not boiling—liquid. Follow the direction to avoid cooking the sauce longer than needed.
Problem: Mushrooms release too much liquid and make the dish watery. Prevention: Cook mushrooms until most of their liquid has evaporated before adding the broth and cream. High heat helps drive off moisture.
Problem: Pasta turns mushy after baking. Prevention: Undercook the spaghetti by about 2 minutes so it finishes cooking in the oven without going soft.
Problem: Top browns too quickly while the center remains cool. Prevention: Place the rack in the top third for baking as instructed, but if broiling, watch closely and pull the dish as soon as the cheese reaches your desired color.
Problem: Bland final dish. Prevention: Season chicken with salt and pepper early and taste the sauce before baking, adjusting salt as needed—remember Parmesan adds salt, so season conservatively.

Year-Round Variations

Use seasonal produce and pantry odds-and-ends to keep the dish fresh all year.

Spring: Toss in a handful of fresh peas or chopped asparagus tips in the last few minutes of sauce assembly for color and brightness.
Summer: Add halved cherry tomatoes after baking for a pop of acidity that cuts the richness.
Fall: Swap cremini mushrooms for a mixed mushroom medley if you have access to seasonal varieties—more umami depth.
Winter: Stir in a small handful of baby spinach into the sauce off heat until wilted for color and nutrients.

Insider Tips

Prep and timing

Chop the onions and slice mushrooms while the water comes to a boil for the pasta—this keeps things moving. Softening the cream cheese ahead of time prevents lumps and speeds the sauce step.

Cheese handling

Freshly grate the Parmesan for the best melting and flavor; pre-grated Parmesan often contains anti-caking agents that affect texture. Shred mozzarella yourself if possible for a better melt and less clumping.

Serving

Let the casserole rest for about 5 minutes after baking; it firms slightly and is easier to portion while still molten on top.

Make Ahead Like a Pro

This dish is very make-ahead friendly:

Assemble through step 9 (mixing pasta, chicken, and sauce) and store in the refrigerator for up to 24 hours. When ready to bake, transfer to the 9×13-inch dish if it isn’t already in one, top with Parmesan and mozzarella, and bake as directed—add a few extra minutes to the baking time if the casserole is cold from the fridge.
Fully baked leftovers keep well in the fridge for 3–4 days. Reheat covered in a 350°F oven until warmed through to preserve moisture; uncover for the last few minutes if you want to re-crisp the top.
To freeze: bake as directed (optionally stop before broiling), cool completely, cover tightly, and freeze up to 2 months. Thaw overnight in the fridge before finishing the bake and broiling to crisp the top.

FAQ

Can I use rotini, penne, or another pasta instead of spaghetti? Yes. The recipe will work with short pasta; just make sure you maintain the slightly undercooked timing so the pasta finishes in the oven.
What if I don’t have heavy cream? The recipe is built around the cream’s richness; using half-and-half will lighten it but may produce a thinner sauce. If you use a lighter cream, keep an eye on texture and consider reducing for a bit longer to thicken.
Can I use pre-shredded cheese? You can, but freshly grated Parmesan and shredded mozzarella from a block melt and taste better. Pre-shredded cheeses often contain additives that change melt behavior.
How do I prevent the top from burning when broiling? Watch it continuously, keep the dish a rack lower if your broiler is aggressive, and remove once golden brown to your liking.
Is this freezer-friendly? Yes—see the make-ahead section. Freeze before or after baking, but thaw fully before finishing in the oven for the best texture.

Serve & Enjoy

Serve warm straight from the baking dish with simple sides: a crisp green salad, quick roasted vegetables, or crusty bread to mop up any sauce. A squeeze of lemon or a light sprinkle of chopped parsley adds a fresh finish if you want a touch of brightness.

Portioning with a wide spatula helps keep each serving intact with that gorgeous cheesy top. This is the kind of recipe that feeds a small crowd, disappears quickly at potlucks, and keeps well for easy lunches the next day. Make it when you want comfort with little fuss and a lot of flavor.

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Three Cheese Chicken Tetrazzini

If you’re searching for a comforting, creamy, and utterly indulgent…

Prep Time15

Cook Time45

Total Time1

Servings: 6 servings

Ingredients

12 ouncesuncooked spaghetti
1 tablespoonolive oil
3 tablespoonsbutterdivided
1/2 mediumonionchopped
2 uncooked chicken breastscut into 1" pieces
Salt & pepperto taste
4 clovesgarlicminced
1/4 teaspoonItalian seasoning
7 ouncescremini or white mushroomssliced
3/4 cupchicken broth
1 cupheavy/whipping cream
8 ouncescream cheese a block of Phillysoftened
1 cupfreshly grated parmesan cheese
1 cupshredded mozzarella cheese

Instructions

Preheat oven to 350°F and move the oven rack to the top third. Soften the cream cheese by microwaving it 20–30 seconds or leaving it at room temperature. Chop the 1/2 medium onion, mince the garlic, slice the mushrooms, and cut the 2 chicken breasts into 1" pieces; season the chicken with salt and pepper to taste.
Bring a large pot of salted water to a boil for the spaghetti.
Cook the 12 ounces uncooked spaghetti until about 2 minutes less than the package time (slightly under al dente). Drain the pasta and set it aside.
While the pasta cooks (or immediately after), heat 1 tablespoon olive oil and 1 tablespoon of the butter in a large pot or deep skillet over medium-high heat.
Add the chopped onion and sauté 4–5 minutes, until the onion is lightly browned.
Add the seasoned chicken pieces to the pot and cook 5–6 minutes, until the chicken is almost cooked through. Transfer the chicken to a plate, leaving any onions in the pot.
Add the 4 cloves minced garlic, the remaining 2 tablespoons butter, and the 1/4 teaspoon Italian seasoning, then add the 7 ounces sliced mushrooms. Cook about 5 minutes, stirring occasionally, until the mushrooms release their liquid and most of it has evaporated.
Increase the heat to high and add 3/4 cup chicken broth, 1 cup heavy cream, and the softened 8 ounces cream cheese (cut into smaller pieces). Stir nearly constantly for about 3–5 minutes until the cream cheese melts and the sauce becomes smooth and slightly thickened. Avoid cooking longer than needed to prevent the sauce from becoming too thick.
Turn off the heat. Return the cooked chicken to the pot and add the drained spaghetti. Stir well so the pasta and chicken are evenly coated with the sauce.
Transfer the mixture to a 9×13-inch baking dish and spread it into an even layer. Sprinkle 1 cup freshly grated Parmesan evenly over the top, then sprinkle 1 cup shredded mozzarella over the Parmesan.
Bake uncovered at 350°F for 30 minutes. After 30 minutes, broil for a few minutes until the top is browned to your liking—watch carefully to avoid burning.
Remove from the oven and let the dish rest about 5 minutes before serving. Use a spatula to cut and serve so each portion has melted cheese on top.

Equipment

Oven
Large Pot
large skillet or deep skillet
9x13 inch Baking Dish
Microwave (optional)

Notes

You can use cooked/rotisserie chicken instead if you wish (follow the recipe as normal but skip step 4 then add 3-4 cups of the cooked chicken in step 7).
12 ounces spaghetti is 3/4 of a pound (16 ounce) package.
Nutritional information is provided as a courtesy only and should be construed as an estimate rather than a guarantee. Ingredients can vary and Salt & Lavender makes no guarantees to the accuracy of this information.