My grandmother clipped this from a 1968 magazine and it's still the only recipe she trusts for company.

This oven baked 3-ingredient chicken tetrazzini is exactly the sort of thing my Midwestern grandmother would have clipped from a 1968 ladies’ magazine and made for every church supper and company dinner. It leans on the pantry staples that defined that era—canned soup, pasta, and cheese—but the result is still deeply comforting: creamy, steamy shredded chicken tangled with tender spaghetti, all under a golden, bubbly cheese top. It’s practical, budget-conscious, and unfussy, which is precisely why it’s the kind of recipe that becomes a family standard and never leaves the recipe box.

Serve this casserole piping hot, straight from the oven, with something crisp and fresh alongside to balance the richness: a simple green salad with a sharp vinaigrette, steamed green beans with lemon, or roasted broccoli. Garlic bread or a warm baguette is very much in the spirit of those 1960s company dinners and perfect for catching any creamy sauce left in the dish. A light, dry white wine or sparkling water with lemon keeps the meal from feeling too heavy, and for dessert, something uncomplicated—fresh fruit, sherbet, or a slice of pound cake—fits the vintage comfort theme.

Servings: 6

12 oz dry spaghetti, broken in half

2 cups shredded mild cheddar cheese (divided, 1 1/2 cups for the casserole, 1/2 cup for topping)

Preheat your oven to 350°F (175°C). Lightly grease a 2 1/2- to 3-quart oval or 9x13-inch casserole dish with butter or nonstick spray. This helps the pasta release easily and encourages a lightly browned edge.

Bring a large pot of well-salted water to a boil. Add the broken spaghetti and cook until just shy of al dente—about 1 to 2 minutes less than the package directions. The pasta will finish softening in the oven, soaking up the sauce. Drain the spaghetti well.

While the pasta cooks, make the simple sauce: In a large mixing bowl, whisk together the condensed cream of mushroom soup and the water until smooth and pourable. You’re aiming for the consistency of a loose cream sauce rather than thick canned soup straight from the can.

Season the soup mixture with the kosher salt and black pepper, stirring to combine. Taste a small spoonful (keeping in mind it’s concentrated and will be mellowed by the pasta and chicken) and adjust the seasoning if needed.

Add the drained spaghetti to the bowl with the soup mixture and toss gently to coat every strand. Fold in the shredded chicken and 1 1/2 cups of the shredded cheddar cheese, making sure the chicken is evenly distributed so every serving has a good mix of pasta, sauce, and meat.

Transfer the mixture to the prepared casserole dish, spreading it into an even layer. Use the back of a spoon to nudge the pasta and chicken down into the sauce so there are no dry pieces poking up, which helps prevent them from getting too crisp.

Sprinkle the remaining 1/2 cup shredded cheddar evenly over the top. This thin layer of cheese will melt, bubble, and form that golden, slightly stretchy top you expect from a classic tetrazzini casserole.

Cover the casserole loosely with foil, tenting it slightly so it doesn’t stick to the cheese. Bake, covered, for 20 minutes to let the sauce heat through and the flavors meld without drying out the top.

Remove the foil and continue baking for another 15 to 20 minutes, or until the casserole is bubbling around the edges, the cheese on top is melted and lightly golden, and you can see some creamy sauce clinging to the visible pasta strands. An instant-read thermometer inserted in the center should read at least 165°F if you want to verify temperature.

Let the casserole rest for 10 minutes before serving. This brief rest allows the sauce to thicken slightly so the portions hold together when you scoop. Use a wooden spoon to lift out generous, steamy spoonfuls, making sure to dig down to capture plenty of creamy pasta, shredded chicken, and melted cheese in each serving.

This pared-down version honors the spirit of a 1960s magazine recipe that relied on pantry staples and a short ingredient list. If you’d like to dress it up a bit while staying true to that era, you can swap one can of cream of mushroom soup for cream of chicken or cream of celery, or stir in 1/4 cup dry sherry with the soup and water for a more traditional tetrazzini flavor. A small handful of frozen peas or sliced canned mushrooms can be folded in with the chicken for color and texture, though that technically takes it beyond three core components. For a slightly different cheese profile, use half mozzarella and half cheddar, or top with Parmesan for a more pronounced golden crust. To make ahead, assemble the casserole up to the point of baking, cover tightly, and refrigerate for up to 24 hours; add 10 to 15 minutes to the covered baking time if baking from cold. For food safety, always start with fully cooked chicken—leftover roast chicken, a store-bought rotisserie bird, or poached breasts work well—and cool it promptly after cooking before shredding. Keep cooked chicken refrigerated and use within 3 to 4 days, or freeze if holding longer. When reheating leftovers, heat until the center is hot and steaming, ideally to 165°F. If the casserole seems dry when reheating, stir in a splash of milk or water and cover with foil to keep it creamy.