Creamy Chicken Spaghetti

Creamy Chicken Spaghetti is the ultimate comfort food casserole, bringing together tender pasta, juicy chicken, and a rich, cheesy sauce that’s baked until bubbly and golden. It’s hearty, family-friendly, and just what you need when you want a warm, satisfying dinner that comes together with simple ingredients.

This easy chicken spaghetti recipe is perfect for busy weeknights or when you need to feed a crowd. Made with pantry staples like cream of chicken soup and Rotel tomatoes, it’s creamy, flavorful, and ready for the oven in less than 20 minutes of prep. Whether you’re serving it fresh from the oven or freezing a batch for later, this dish is sure to become a regular in your dinner rotation.

Ingredients

The full printable recipe card with measurements and instructions is found at the bottom of the post.

• Spaghetti: Regular spaghetti noodles work well here, but you can also substitute whole wheat or gluten-free pasta if needed. Cook it just until al dente since it will continue baking in the oven.
• Unsalted butter: Using unsalted butter lets you control the salt level in the dish. If you only have salted butter, reduce the added salt later.
• Yellow onion: You can substitute with white onion or even a couple of shallots if that’s what you have on hand.
• Green bell pepper: Red or yellow peppers can be used for a sweeter twist.
• Garlic: Fresh garlic is best, but you can use ½ teaspoon of garlic powder in a pinch.
• Cooked shredded chicken: Rotisserie chicken is a great shortcut. Leftover roast chicken or even poached chicken breasts will also work.
• Cream of chicken soup: If you’d like to skip canned soup, you can make a quick homemade version with butter, flour, chicken broth, and milk. Cream of mushroom soup will also work.
• Rotel diced tomatoes and green chilies: If you prefer it milder, use plain diced tomatoes instead.
• Sour cream: Greek yogurt can be substituted if you want a lighter option.
• Cheddar cheese: Sharp cheddar gives the best flavor, but you can mix it with Monterey Jack, Colby, or mozzarella for a gooier melt.
• Italian seasoning: If you don’t have it, use a mix of dried oregano and basil.
• Salt and black pepper: Season carefully, especially if your soup and cheese are already salty.
• Parsley: A fresh garnish brightens the dish and adds a pop of color.

How to Make Creamy Chicken Spaghetti

• Step One: Preheat oven to 350°F. Lightly grease a 9×13-inch baking dish.
• Step Two: Cook the spaghetti in a large pot of salted boiling water until just al dente. Reserve ½ cup of pasta water for later. Drain and set aside.
• Step Three: In a large skillet over medium heat, melt the butter. Add the onion and bell pepper, and cook for about 5 minutes, until softened. Stir in the garlic and cook for one more minute.
• Step Four: In a large mixing bowl, combine the cream of chicken soup, Rotel tomatoes, sour cream, 1 ½ cups of the shredded cheese, Italian seasoning, salt, and pepper. Stir in the cooked chicken and sautéed veggies.

• Step Five: Add the drained spaghetti to the sauce mixture and toss to coat everything evenly. Add reserved pasta water, one tablespoon at a time, if the mixture is dry. 

• Step Six: Pour the mixture into the prepared baking dish. Top with the remaining ½ cup of shredded cheese.
• Step Seven: Bake uncovered for 25–30 minutes, or until bubbly and lightly golden on top.
• Step Eight: Garnish with parsley (if using) and serve hot.

What to Serve With It

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This cheesy chicken spaghetti is rich and filling, so it pairs best with lighter, fresh sides. A few ideas to round out the meal:

• Green salad: A crisp side salad with a tangy vinaigrette helps balance the creaminess of the pasta.
• Garlic bread or breadsticks: Perfect for soaking up the cheesy sauce.
• Roasted vegetables: Try broccoli, green beans, or zucchini for a simple side.
• Fruit salad: Adds a light, refreshing finish to the meal.

Variations and Substitutions

• No canned soup: If you’d prefer to skip the cream of chicken soup, make a quick homemade version. Melt 2 tablespoons of butter in a saucepan, whisk in 2 tablespoons of flour, then slowly add 1 cup of chicken broth and ½ cup of milk. Cook until thickened, then use in place of the canned soup.
• Cheese swaps: Cheddar is classic, but you can change it up with Monterey Jack, Colby, or mozzarella cheese for extra gooeyness. For a spicy kick, try Pepper Jack.
• Different proteins: Swap the chicken for cooked turkey (perfect for holiday leftovers) or even diced ham. If you want to go meatless, sautéed mushrooms make a hearty alternative.
• Veggie add-ins: Stir in spinach, mushrooms, or broccoli for an extra flavor boost. Frozen veggies work just as well as fresh.
• Make it spicy: Use hot Rotel instead of mild, add a pinch of cayenne pepper, or stir in red pepper flakes to give the casserole a little heat.
• Velveeta version: For a nostalgic Southern twist, replace part of the shredded cheese with cubed Velveeta for an ultra-creamy, old-fashioned casserole.
• Gluten-free: Use gluten-free pasta and a gluten-free condensed soup (or make a homemade version with cornstarch instead of flour).
• Lighter option: Swap sour cream for plain Greek yogurt and use reduced-fat cheese for a slightly lighter take on the dish.

Storage Instructions

• Refrigerator: Store leftovers in an airtight container in the fridge for up to 3 days. Reheat in the microwave or cover with foil and warm in a 325°F oven until heated through.
• Freezer (unbaked): Assemble the casserole, cover it tightly with plastic wrap, and then foil. Freeze for up to 3 months. When ready to bake, thaw overnight in the fridge and add about 10 extra minutes to the baking time.
• Freezer (baked): You can also freeze leftovers after baking. Let the casserole cool completely, then portion into freezer-safe containers. Reheat individual servings in the microwave or warm larger portions in the oven.
• Make ahead: Assemble the casserole earlier in the day, cover, and refrigerate for up to 24 hours before baking. When you’re ready, bake as directed, adding about 10 extra minutes to account for the chilled dish.
• Prevent dryness: When reheating, add a splash of chicken broth, cream, or milk to restore the creamy texture.

Recipe Tips and Tricks

• Cook pasta al dente: Since the spaghetti bakes in the oven, slightly undercook it during boiling to keep it from turning mushy.
• Reserve pasta water: Adding a splash of the starchy water to the sauce mixture helps everything cling to the noodles.
• Shred your own cheese: Pre-shredded cheese often has anti-caking agents that prevent smooth melting. Freshly grated cheddar makes the sauce creamier.
• Use a big mixing bowl: Tossing the pasta with the sauce before transferring to the casserole dish ensures every strand is coated.
• Cover for gentler reheating: When warming up leftovers, cover the dish with foil to lock in moisture and keep the casserole from drying out.
• Make it look pretty: A sprinkle of parsley or extra cheese on top just before serving adds color and makes the dish look extra inviting.

Spaghetti Recipes

• Spaghetti Casserole
• Mexican Spaghetti
• Crack Chicken Spaghetti
• One-Pan Spaghetti
• Spaghetti Pie

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