Name: Best Creamy Chicken Spaghetti
Prep time: 20 min
Cook time: 40 min
Total time: 60 min
Ingredients: 12 ounces spaghetti; 2 tablespoons fine salt; 3 cups cooked chicken, (chopped or shredded); 1/2 teaspoon salt; 1 teaspoon black pepper, (divided); 1/2 teaspoon paprika; 1 (15-ounce) can petite diced tomatoes; 1/4 teaspoon sugar; 1/4 cup butter; 1 small onion, (finely diced); 1/2 medium green bell pepper, (finely diced); 4 cloves garlic, (minced); 1/2 teaspoon smoked paprika; 3/4 teaspoon mustard powder; 1 teaspoon onion powder; 1/4 cup all-purpose flour; 2 1/2 cups chicken broth; 2 cup half-and-half; 1/2 cup evaporated milk; 1 1/2 teaspoons chicken base Better Than Bouillon; 4 ounces cream cheese (softened); 2 cups sharp cheddar cheese, (freshly shredded, + divided); 2 cups Pepper Jack cheese, (freshly shredded, + divided); 1 teaspoon Worcestershire sauce; 1/2 teaspoon Tabasco sauce; 1/8 teaspoon cayenne pepper (optional ); 1 tablespoon chopped parsley

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Golden, bubbly, and unapologetically creamy, this Best Chicken Spaghetti is the classic baked casserole version made completely from scratch. Built on a proper roux and enriched with half-and-half, the sauce stays silky, generously creamy, and never watery — even after baking.

This is the from-scratch, comfort-food classic you make when you want the absolute best. If you’re looking for a faster weeknight option, try my Easy Chicken Spaghetti. But when you want the creamy, cheesy, baked version that tastes like Sunday dinner? This is it.

✨ Before You Begin

✨ Salt your pasta water properly. It should taste like the sea. Well-seasoned pasta is the foundation of the entire dish.

✨ Dice the onion and pepper very small. This keeps the casserole creamy and cohesive instead of chunky.

✨ Drain the tomatoes thoroughly. Extra liquid will thin the sauce.

✨ Cook pasta just to al dente. It finishes cooking in the oven.

✨ Shred your own cheese. It melts smoother than pre-shredded varieties.

Ingredients + Key Notes

Spaghetti: Classic texture; break in half if you prefer easier serving.

Salted water: Properly seasoned pasta prevents a flat-tasting casserole.

Cooked chicken: Rotisserie or leftover chicken works beautifully — keep pieces bite-sized for the best sauce ratio.

Salt, pepper, paprika: Season the chicken before it hits the sauce so every layer tastes good.

Petite diced tomatoes: Blend in better than large chunks and keep the casserole classic.

Sugar + pinch of salt: Softens acidity and rounds out flavor.

Butter: Builds flavor and forms the roux so the sauce stays creamy.

Onion + bell pepper: Finely diced so they melt into the sauce.

Garlic: Added last so it doesn’t burn.

Smoked paprika + mustard powder: Adds depth and makes the cheese taste more savory.

Flour: Thickens the sauce; cook a full 2 minutes to remove raw flavor.

Chicken broth: Adds savory depth so the sauce isn’t just dairy-heavy.

Half-and-half + evaporated milk: The richness lever — keeps it generously saucy after baking.

Chicken base (BTB): Concentrated flavor that makes the sauce taste restaurant-quality.

Cream cheese: Extra silky and helps stabilize the sauce.

Cheddar + Pepper Jack (divided): Melt some into the sauce; top the rest for a golden finish.

Worcestershire + Tabasco: Adds depth and brightness so the sauce doesn’t taste heavy.

Cayenne (optional): Extra warmth if you like a little heat.

🥣 How to Make Creamy Chicken Spaghetti

Here’s a quick look at how to assemble this easy Chicken Spaghetti (full instructions in the recipe card below).

Heat your oven to 350°F and grease a 9×13 baking dish. Drain the tomatoes for 4 minutes, press once with a spoon, then toss with sugar and a pinch of salt.

Cook the spaghetti in 6 quarts of boiling water with 2 tablespoons fine salt until al dente, then drain (don’t rinse). While it cooks, season the chicken with salt, paprika, and half the pepper.

Melt the butter and sauté the onion and bell pepper until soft. Add the garlic for 30 seconds, then stir in the smoked paprika, mustard powder, onion powder, and remaining pepper just until fragrant.

Sprinkle the flour over the vegetables and whisk into a smooth paste. Cook 2 minutes, then gradually whisk in the broth until smooth. Add the half-and-half and evaporated milk and cook until thickened but still creamy.

Reduce the heat and melt in the cream cheese, then stir in 1 cup cheddar and 1 cup Pepper Jack until silky. Finish the sauce with chicken base, Worcestershire, Tabasco, cayenne (if using), and the drained tomatoes.

Stir in the chicken, then toss everything with the spaghetti until evenly coated. Transfer to the baking dish, top with remaining cheeses, and bake 30 minutes until bubbling around the edges. Let rest 10 minutes before serving. Sprinkle with parsley and serve.

⭐ Pro Tips

⭐ Cook the roux fully. Two minutes builds flavor and prevents a floury taste.

⭐ Keep the sauce slightly loose before baking. It will set as it rests.

⭐ Don’t overbake. Pull once the edges bubble — overbaking tightens the sauce.

⭐ The Tabasco adds brightness, not heat. It keeps the sauce from tasting heavy.

Storing + Reheating + Freezing + Make-Ahead Tips

Storing

Store leftovers in an airtight container in the refrigerator for up to 4 days. The flavors deepen over time, making leftovers especially delicious.

Reheating

For larger portions, cover the casserole with foil and reheat in a 350°F oven for 15–20 minutes. If the casserole has been stored in a glass or ceramic baking dish, allow it to come to room temperature before placing it in a preheated oven to prevent shattering. Alternatively, transfer leftovers to an oven-safe pan before reheating.

For smaller portions, microwave in short intervals, stirring occasionally, until heated through.

Freezing

Freeze tightly wrapped for up to 3 months. Thaw overnight in the refrigerator before reheating.

Make-Ahead

Assemble the casserole, cover, and refrigerate for up to 24 hours before baking.

What to Serve With Chicken Spaghetti

Fresh + Crisp Sides

A fresh salad is the perfect contrast to this rich, creamy casserole. Try KFC Coleslaw for something classic, or a simple House Salad to keep things light and balanced.

Vegetable Sides

A simple vegetable helps round out the meal without adding extra heaviness. Southern Green Beans are a great choice, or Honey Glazed Carrots for a slightly sweet, comforting option.

Cozy Breads

Warm bread is perfect for soaking up that creamy sauce. Lion House Rolls are always a favorite, or go with Cheddar Biscuits for something extra cozy.

Sweet Finishes

For dessert, keep it simple with either Peach Cobbler for a classic Southern finish or Toll House Cookies for an easy, crowd-pleasing option.

Frequently Asked Questions

◆ Can I use rotisserie chicken?

Yes — it works beautifully here.

◆ Can I make this ahead of time?

Yes. Assemble, cover, and refrigerate up to 24 hours before baking.

◆ How do I keep it from getting mushy?

Cook the pasta just to al dente. It finishes cooking in the oven.

◆ Can I make it spicier?

Increase cayenne or use more Pepper Jack.

Still have questions? Drop them in the comments — I love helping you bake + cook with confidence! 💗

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