Weeknight Casserole

Southern Chicken Spaghetti Casserole

Spaghetti cooked shy of al dente, folded into a sauce of two condensed soups, Rotel, cream cheese and sour cream with cooked chicken, then baked under three cups of cheese.

55 min · 8 servings · Dinner, Casserole, Pasta

Baking dish of chicken spaghetti casserole under a browned cheddar and Monterey Jack crust, flecked with parsley

Recipe by Emily Carter

on Recipesdarleen

37 recipes by Emily Carter

Published November 18, 2025

How Recipesdarleen publishes recipes

Spaghetti folded into a skillet sauce built from two condensed soups, Rotel, cream cheese and sour cream, with three cups of cooked chicken, then baked under cheddar and Monterey Jack.

Twenty-five minutes at the hob, twenty-five in the oven, and a ten-minute rest. Eight servings.

Why This Recipe Works

  • The pasta is cooked a full minute shy of al dente. It finishes in the oven, absorbing sauce as it goes, and pasta boiled to package time comes out of a 25-minute bake soft.
  • Two condensed soups rather than a double tin of one. Cream of chicken reinforces the meat and cream of mushroom brings an earthiness that the dish would otherwise lack entirely.
  • The Rotel is lightly drained rather than fully. Some of that liquid is wanted for acidity; all of it would thin a sauce that is about to meet twelve ounces of pasta.
  • Cheese is split three ways — a cup and a half of cheddar on top, all the Monterey Jack on top, and half a cup of cheddar left for seasoning the mix. Jack melts smoothly where cheddar alone can go oily.
  • Everything in the dish is already cooked when it goes in the oven, which is why 20 to 25 minutes is enough and why the optional broil is only about colour.

How The Sauce Is Built In The Skillet

Steps 3 to 6 turn eight separate things into one sauce before a strand of pasta is involved. Each addition waits for the one before it to melt or soften.

  1. The aromatics

    5-6 minutes, then 30 seconds

    2 tbsp butter, 1 tbsp olive oil, onion, green bell pepper, garlic

    Five to six minutes of softening, then thirty seconds for the garlic. Butter and oil together — the butter for flavour, the oil so it does not burn while the pepper softens.

  2. The body

    Cream of chicken soup, cream of mushroom soup, Rotel, 4 oz cream cheese

    Two condensed soups rather than one, plus the tin of Rotel for acidity and heat. The cream cheese goes in here and is stirred until the sauce is smooth — it is the difference between a soup sauce and a creamy one.

  3. The loosening

    1 cup sour cream, 1 cup low-sodium chicken broth

    Condensed soup plus cream cheese is far too thick to coat twelve ounces of spaghetti. The broth thins it and the sour cream brings a tang that cuts three cups of cheese.

  4. The seasoning and the chicken

    Simmer 2-3 minutes

    Salt, pepper, smoked paprika, garlic powder, onion powder, optional Cajun seasoning, 3 cups cooked chicken

    Dry seasonings into a hot sauce so they hydrate, then the chicken simmered two to three minutes to take it up. Taste and adjust here, before the pasta dilutes everything.

Then tasteSpaghetti tossed through at step 7, loosened with reserved pasta water if the mixture has tightened. Then into the dish, cheese over the top, and only 20 to 25 minutes of baking — everything is already cooked, so the oven is there to melt and brown rather than to cook.

Ingredient Notes

Cooked shredded chicken
Three cups, already cooked — the recipe suggests rotisserie. Nothing raw goes into this dish at any stage.
Rotel diced tomatoes with green chilies
One 10-ounce tin, LIGHTLY drained. Not fully: some of that liquid is the acidity the sauce needs.
Cream cheese, softened
Four ounces, softened so it melts into the soups rather than sitting in lumps. A small amount doing a lot of textural work.
Sharp cheddar and Monterey Jack
Two cups and one cup. The Jack melts more smoothly than cheddar, which is why the top uses both rather than three cups of cheddar.
Panko with melted butter
Half a cup tossed with a tablespoon of butter, marked optional. Buttered first so it browns rather than drying out.

How to Make It

  1. Heat the oven and grease the dish

    Preheat the oven to 350°F. Grease a 9x13-inch baking dish.

  2. Boil the spaghetti shy of al dente

    Bring a large pot of salted water to a boil. Cook the spaghetti to just shy of al dente (about 1 minute less than package). Reserve 1/2 cup pasta water, then drain.

  3. Soften the aromatics

    In a large skillet, heat the butter and olive oil over medium heat. Sauté the onion and bell pepper until softened, 5 to 6 minutes. Stir in the garlic for 30 seconds until fragrant.

  4. Build the sauce base

    Whisk in the cream of chicken soup, cream of mushroom soup and Rotel. Add the cream cheese and stir until the sauce is smooth and melty.

  5. Loosen and season

    Stir in the sour cream and chicken broth until creamy. Season with the salt, pepper, smoked paprika, garlic powder, onion powder and Cajun seasoning (if using).

  6. Add the chicken

    Fold in the shredded chicken and simmer 2 to 3 minutes. Taste and adjust the salt and pepper.

  7. Toss the pasta through

    Add the cooked spaghetti to the skillet and toss to coat. If the mixture seems thick, loosen with a splash of reserved pasta water.

  8. Fill the dish and top

    Transfer to the prepared baking dish. Top with 1 1/2 cups cheddar and all the Monterey Jack. If using, toss the panko with melted butter and sprinkle on top.

  9. Bake

    Bake 20 to 25 minutes until bubbly and lightly golden. Broil 1 to 2 minutes for extra colour, watching closely.

  10. Rest and serve

    Rest 10 minutes, garnish with parsley and serve warm.

Success Tips

  • Pull the spaghetti a full minute early; it finishes in the oven.
  • Save the half cup of pasta water before you drain.
  • Soften the cream cheese so it disappears into the soups.
  • Taste the sauce before the pasta goes in — afterwards everything is diluted.
  • Stand at the oven if you broil; a minute is the difference between golden and burnt.

Serving Ideas

A one-dish dinner that feeds a crowd. Something sharp and green alongside does more for it than bread.

Storage and Reheating

Refrigerate

Refrigerate up to 4 days, covered. The pasta keeps absorbing sauce, so leftovers are denser.

Freeze

Freezes for up to 2 months baked and cooled. Thaw overnight in the fridge before reheating.

Reheat

Covered at 350°F with a splash of broth stirred through, uncovering at the end to bring the top back.

Frequently Asked Questions

Can I use raw chicken?

Not in this method. The recipe calls for three cups of already-cooked shredded chicken, and the 20-to-25-minute bake is a melt-and-heat rather than a cook. Raw chicken would need a different recipe.

Mine came out dry.

Usually the pasta water was skipped, or the spaghetti was boiled to full package time and drank the sauce in the oven. Pull it a minute early and keep that half cup back.

Can I use two tins of the same soup?

It works, but you lose the contrast. Cream of mushroom is providing an earthiness that cream of chicken does not, and using two of either flattens the sauce.

How do I add heat?

The optional half teaspoon of Cajun or Creole seasoning is where the recipe puts it. A hot Rotel instead of the standard tin is the other lever.

Recipesdarleen

Southern Chicken Spaghetti Casserole

Spaghetti cooked shy of al dente, folded into a sauce of two condensed soups, Rotel, cream cheese and sour cream with cooked chicken, then baked under three cups of cheese.

Prep
20 min
Cook
35 min
Total
55 min
Yield
8 servings

Dinner, Casserole, PastaSouthern American

Equipment9x13-inch baking dish · Large skillet · Large pasta pot

Before you startReserve half a cup of pasta water before draining. The sauce tightens the moment hot spaghetti goes into it, and that starchy water is what loosens it back without thinning the flavour.

Ingredients

Instructions

  1. Preheat the oven to 350°F. Grease a 9x13-inch baking dish.
  2. Bring a large pot of salted water to a boil. Cook spaghetti to just shy of al dente (about 1 minute less than package). Reserve 1/2 cup pasta water, then drain.
  3. In a large skillet, heat butter and olive oil over medium heat. Sauté onion and bell pepper until softened, 5–6 minutes. Stir in garlic for 30 seconds until fragrant.
  4. Whisk in cream of chicken soup, cream of mushroom soup, and Rotel. Add cream cheese and stir until the sauce is smooth and melty.
  5. Stir in sour cream and chicken broth until creamy. Season with salt, pepper, smoked paprika, garlic powder, onion powder, and Cajun seasoning (if using).
  6. Fold in shredded chicken and simmer 2–3 minutes. Taste and adjust salt and pepper.
  7. Add cooked spaghetti to the skillet and toss to coat. If the mixture seems thick, loosen with a splash of reserved pasta water.
  8. Transfer to the prepared baking dish. Top with 1 1/2 cups cheddar and all the Monterey Jack. If using, toss panko with melted butter and sprinkle on top.
  9. Bake 20–25 minutes until bubbly and lightly golden. Broil 1–2 minutes for extra color, watching closely.
  10. Rest 10 minutes, garnish with parsley, and serve warm.