This oven baked 4-ingredient chicken tetrazzini is exactly the kind of dish my aunt used to bring to every church potluck in the 1970s: creamy, comforting, and designed to feed a crowd with almost no fuss. It leans into the classic Midwestern pantry—canned soup, pasta, cheese, and a rotisserie chicken—so you can have it in the oven in about 15 minutes. While true Italian tetrazzini has more moving parts, this pared-down version captures the same cozy, creamy, cheesy spirit with a nostalgic, casserole-style shortcut that still gets rave reviews decades later.
Serve this casserole piping hot with a crisp green salad dressed in a tangy vinaigrette to balance the richness, and add some warm garlic bread or dinner rolls to soak up the extra sauce. A simple side of steamed green beans or roasted broccoli works nicely, too. If you’re serving a crowd, round things out with a fruit salad or a light dessert like lemon bars to keep the meal from feeling too heavy.
Oven Baked 4-Ingredient Chicken TetrazziniServings: 10-12
Ingredients
1 lb dry spaghetti, broken in half
4 cups cooked shredded chicken (about 1 large rotisserie chicken, skin and bones removed)
3 cans (10.5 oz each) condensed cream of mushroom soup
3 cups shredded Parmesan cheese, divided (about 12 oz)
Directions
Preheat your oven to 350°F (175°C). Lightly grease a 9x13-inch baking dish (or a similar large casserole dish) with butter or nonstick spray.
Bring a large pot of well-salted water to a boil. Add the spaghetti and cook until just shy of al dente, about 1–2 minutes less than the package directions. The pasta will finish cooking in the oven, which helps it stay pleasantly firm.
While the spaghetti cooks, place the shredded chicken in a large mixing bowl. Add the condensed cream of mushroom soup (do not dilute with water or milk). Stir until the chicken is evenly coated and the mixture is smooth and creamy.
Drain the spaghetti very well, shaking off excess water so it doesn’t thin the sauce. Add the hot spaghetti to the chicken and soup mixture. Add 2 cups of the shredded Parmesan cheese. Toss everything together until the pasta and chicken are thoroughly coated and the cheese is evenly distributed.
Transfer the mixture to the prepared baking dish, spreading it into an even layer and gently pressing it down so you don’t have any large air pockets. Sprinkle the remaining 1 cup of shredded Parmesan cheese evenly over the top to create a generous cheese layer that will brown in the oven.
Cover the dish loosely with foil, tenting it slightly so it doesn’t stick to the cheese. Bake for 20 minutes, then remove the foil and continue baking for another 15–20 minutes, or until the casserole is bubbling around the edges and the top is golden brown with spots of deeper color.
For a deeper golden crust and a bit of cheese crispness, you can broil the casserole on the top rack for 1–3 minutes at the end of baking. Watch closely so the cheese browns but does not burn.
Let the tetrazzini rest for at least 10 minutes before serving. This brief rest allows the sauce to thicken slightly so the portions hold together when you scoop them out. Serve warm, scooping generous portions with a large spoon to show off the creamy strands of spaghetti and melted, stretchy cheese.
Variations & Tips
You can easily adapt this old-school casserole while keeping the spirit of the original. For a slightly looser, saucier texture, stir in up to 1/2 cup of hot pasta cooking water when you mix the spaghetti with the chicken and soup. If you prefer a little more depth of flavor without adding extra ingredients, choose a rotisserie chicken that’s well seasoned; the drippings and darker meat will enrich the dish. You can also swap part of the Parmesan for another hard, salty cheese like Romano if that’s what you have on hand, but keep the total cheese amount the same so the top still browns nicely. If you need to make this ahead, assemble the casserole, cover tightly, and refrigerate for up to 24 hours; add 10–15 minutes to the covered baking time to ensure it heats through. Leftovers reheat well in a 300°F oven, covered, with a splash of water added to keep things creamy. For food safety, cool leftovers within 2 hours, store them in shallow containers, and refrigerate for up to 3–4 days; reheat to an internal temperature of 165°F before serving. If you’re using a store-bought rotisserie chicken, avoid letting it sit at room temperature for more than 2 hours (or 1 hour if your kitchen is very warm), and be sure to remove all bones and cartilage before shredding so no small pieces end up in the finished casserole.
