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This Creamy Chicken Spaghetti Casserole is comfort food with a little kick! Tender spaghetti is tossed in a rich, cheesy sauce layered with smoky spices, poblano peppers, and a splash of beer for depth. Topped with melty Monterey Jack and cheddar, it bakes up bubbly, golden, and downright irresistible. It’s hearty enough for Sunday dinner, yet easy enough for a weeknight when you’re craving something cozy and satisfying.
If you love creamy baked pasta casseroles like my Chicken Tetrazzini, zesty Dorito Casserole, cheesy Chicken Spaghetti with Rotel, or stovetop favorites like my Stovetop Chicken Spaghetti, this Tex-Mex twist will be right up your alley.
Let’s make this!!
Why This Recipe Works
- Tex-Mex comfort: A unique twist on spaghetti casserole with poblano, jalapeño, and smoky spices.
- Creamy + cheesy: A rich sauce thickened with a proper roux ensures every bite is silky and flavorful.
- Family-friendly: Mild enough for most palates, but you can turn up the spice to taste.
- Make-ahead option: Assemble in advance, then bake when ready for a stress-free dinner.
Before You Start
✨ Use al dente pasta: Cook spaghetti just until al dente so it holds up during baking without turning mushy.
✨ Control the heat: Removing ribs and seeds from the jalapeño keeps things mild. Want it spicier? Leave some in!
✨ Don’t rush the roux: Cooking the flour and spices in butter for a minute or two deepens flavor and prevents a raw flour taste.
✨ Beer adds depth: A light lager or Mexican-style beer works beautifully. For a non-alcoholic version, swap chicken broth.
✨ Cheese matters: Monterey Pepper Jack gives it creaminess with a little heat, while cheddar adds classic casserole flavor.
Ingredients for Chicken Spaghetti Casserole
(This isn’t the full list — you’ll find every measurement in the recipe card below, but here are a few notes on key ingredients you’ll want to pay attention to.)
- Spaghetti (16 ounces): Cook just to al dente for best texture.
- Butter (½ cup, divided): Creates richness and forms the base for the roux.
- Onion, poblano, jalapeño, and garlic: Build layers of savory flavor.
- All-purpose flour (½ cup): Thickens the creamy sauce.
- Chili powder, cumin, coriander, oregano: Warm spices that give the sauce Tex-Mex depth.
- Whole milk (2 ½ cups): Creamy base for the sauce.
- Beer (12 ounces): Adds malty flavor and richness (or sub chicken broth).
- Worcestershire sauce & chili sauce: Tangy-sweet notes that balance the spice.
- Salt & black pepper: Essential seasoning.
- Monterey Pepper Jack & cheddar cheese: Melty, creamy, and just a little spicy.
- Chicken (4 cups): Cubed or shredded—rotisserie chicken works great.
- Cilantro (2 tablespoons): Fresh garnish for brightness.
Pro Tips For The Best Chicken Spaghetti Casserole
⭐️ Cook pasta al dente: Since it will bake again, undercooking just slightly keeps the spaghetti from going mushy.
⭐️ Pick your spice level: Removing the jalapeño ribs and seeds keeps it family-friendly. If you like more heat, leave some in or add a pinch of cayenne.
⭐️ Beer choice matters: A light lager or Mexican beer (like Modelo or Corona) adds depth without bitterness. Avoid strong IPAs, which can overpower the sauce.
⭐️ Shred cheese yourself: Pre-shredded cheese has anti-caking agents that can make sauces grainy. Grating your own makes the casserole creamier.
⭐️ Make it ahead: Assemble, cover, and refrigerate up to 24 hours before baking. It’s a lifesaver on busy nights.
How To Make Chicken Spaghetti Casserole
Storing + Reheating + Freezing + Make-Ahead Tips
Storing
- Keep leftovers tightly covered in the fridge for up to 3 days.
Reheating
- Reheat in a 350°F oven, covered with foil, for 15–20 minutes until warmed through. Individual servings can be microwaved with a splash of milk to keep them creamy.
Freezing
- Assemble the casserole (without baking), wrap tightly in foil, and freeze for up to 2 months. Thaw overnight in the fridge before baking.
Make-Ahead
- Prepare the casserole up to 24 hours ahead, refrigerate, then bake just before serving.
What to Serve With Chicken Spaghetti Casserole
A rich, cheesy casserole like this shines when you round it out with something fresh, some cozy breads, a side of vegetables, and of course, a sweet ending. Here are some favorites:
Fresh + Crisp Sides: Balance the richness with something cool and crunchy. KFC Coleslaw, a juicy Tomato Salad, or my zesty Southwest Salad all pair beautifully.
Cozy Breads: No casserole night is complete without bread on the table. Try my fluffy Bisquick Biscuits, buttery Crescent Rolls, or a slice of slightly spicy Jalapeño Cornbread.
Vegetables: Keep it homestyle with a warm veggie side. Okra and Tomatoes, savory Texas Roadhouse Green Beans, or sweet Candied Carrots make the meal extra hearty.
Sweet Finishes: For dessert, stick with Southern comfort classics. A slice of Chess Pie, Coca Cola Cake, or tender Strawberry Cake is the perfect way to end the meal.
Frequently Asked Questions
Can I use a different pasta instead of spaghetti?
Yes! Linguine, fettuccine, or even penne all work here. Just be sure to cook to al dente.
What can I substitute for the beer?
Non alcoholic beer, like NA Stella or chicken broth is the best swap. You’ll still get a rich sauce without the alcohol.
Can I make this casserole spicier?
Definitely. Add extra jalapeño, use hot chili powder, or stir in a pinch of cayenne with the spices.
Does this freeze well?
Yes — assemble it, wrap tightly in foil, and freeze for up to 2 months. Thaw overnight before baking.
Can I use rotisserie chicken?
Absolutely — it’s my favorite shortcut. Shredded or cubed works equally well.
More Chicken Pasta Recipes
If you can’t get enough of cozy, cheesy chicken pasta, here are more reader favorites to try next:
- Creamy Lemon Chicken Pasta: Bright and zesty comfort food.
- Chicken Fajita Pasta: All the Tex-Mex flavors in one skillet.
- Chicken Alfredo Lasagna: Rich, layered, and indulgent.
- Chicken Bacon Ranch Pasta: Smoky, creamy, and family-approved.
- Marry Me Chicken Tortellini: Irresistible comfort with tender pasta pillows.
- Chicken Spaghetti with Rotel: A creamy classic with a little kick.
- Crack Chicken Spaghetti: Loaded with cheese, bacon, and ranch flavor.
- Buffalo Chicken Casserole: Creamy with a spicy twist.
Tried This Recipe?
I’d love to know what you think! Be sure to leave a ⭐️⭐️⭐️⭐️⭐️ rating and comment below if you make this Chicken Spaghetti Casserole. And don’t forget to tag me @gonna_want_seconds if you share your casserole on Instagram—I love seeing your kitchen creations!
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Thanks for stopping by my kitchen today — happy cooking, friends! ❤️ Kathleen
Chicken Spaghetti Casserole
Ingredients
- 16 ounces spaghetti
- 1/2 cup butter divided
- 1 medium onion, chopped
- 2 poblano peppers, chopped
- 1 jalapeno, ribs removed, seeded and chopped
- 1 tablespoon garlic, minced
- 1/2 cup all-purpose flour
- 1 tablespoon chili powder
- 1 tablespoon ground cumin
- 2 teaspoons ground coriander
- 2 teaspoons dried oregano
- 2 1/2 cups whole milk
- 1 (12 ounce) can beer
- 1 tablespoon Worcestershire sauce
- 1/2 cup chili sauce
- 1 1/2 teaspoons salt
- 1/2 teaspoon black pepper
- 3 cups Monterey Pepper Jack cheese, - divided shredded
- 4 cups chicken, cubed or shredded
- 1 cup cheddar cheese, shredded
- 2 tablespoons cilantro, chopped
Instructions
- Preheat oven to 350°F (177°C). Spray an 11X14 inch baking dish with nonstick cooking spray.
- Cook spaghetti (16 ounces) in well-salted water according to package instructions just to al dente. Drain pasta well then add back to the pasta pot.
Sauce:
- In a large skillet, add 2 tablespoons butter and saute onion (1), garlic (1 tablespoon), poblano (2), and jalapeno (1) over medium-high until onion is translucent but not brown.
- Add the remaining butter to the skillet and melt. When butter begins to bubble, sprinkle flour (1/2 cup), chili powder (1 tablespoon), cumin (1 tablespoon), coriander (2 teaspoons), and oregano (2 teaspoons) over the top and whisk over medium heat until evenly combined. Cook, stirring constantly, until spices become fragrant, about 1-2 minutes.
- Remove skillet from heat and slowly whisk in milk (2 1/2 cups) and beer (1 can). Return to medium heat and cook until the mixture begins to bubble and thicken. Reduce heat to low and stir in Worcestershire Sauce (1 tablespoon), chili sauce (1/2 cup), salt (1 1/2 teaspoon), pepper (1/2 teaspoon), and 1 1/2 cups Monterey Pepper Jack cheese.
- Pour sauce over pasta in the pot, add chicken (4 cups) then toss to coat evenly. Pour into the prepared baking dish, sprinkle the remaining Monterey pepper jack and cheddar (1 cup) over the top. Bake in the preheated oven until heat through and bubbly, about 25-30 minutes. Remove from oven, garnish with cilantro (2 tablespoons), and serve.
Fans Also Made:
Nutrition
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Never would have thought of these ingredients but it was awesome and a definite make again! Husband suggested we trade chicken for smoked pulled pork next time.
Hi Carole! I’m happy you and your hubby enjoyed!
Love this sauce! The only change I made was I didn’t make it as spicy as the recipe calls for. I def have this recipe bookmarked! Thank you for sharing!
You’re so welcome Karen! So happy to hear you enjoyed <3