This Chicken Spaghetti Casserole is cozy, fast, and feeds a crowd without fuss. Tender shredded chicken, saucy spaghetti, a kick of diced tomatoes with green chiles, and a molten cheese top make it a weeknight winner — and if you like easy, make-ahead chicken dishes, you might also enjoy this crockpot BBQ chicken for busy nights.
Why you’ll love this dish
This casserole hits the comfort-food sweet spot: it’s creamy without being heavy, stretches leftovers into several meals, and is forgiving for beginner cooks. It’s perfect for weeknights, potlucks, or when you want something family-friendly that still feels special.
“A crowd-pleasing, no-fuss meal — cheesy, slightly spicy, and always gone before you can grab seconds.”
Reasons to try it:
- Budget-friendly: uses pantry staples like canned soup and dried spaghetti.
- Quick assembly: most of the time is hands-off in the oven.
- Kid-approved: familiar flavors and gooey cheese.
- Make-ahead: assemble in the morning and bake later.
The cooking process explained
This recipe follows a simple flow: cook the pasta just short of done, sauté aromatics, toss everything together with broth and soup for a saucy base, top with cheese, and bake until bubbly. The chicken is already cooked (rotisserie or leftovers work great), so the bake is just long enough to meld flavors and finish the texture — keep the pasta slightly undercooked so it doesn’t go mushy during baking.
What you’ll need
- 8 oz spaghetti (regular or gluten-free)
- 2 cups cooked chicken, shredded (rotisserie or poached)
- 2 cups chicken broth (reduces sogginess if measured)
- 1 can (10.5 oz) cream of mushroom soup (substitute cream of chicken if preferred)
- 1 cup diced tomatoes with green chiles (adds brightness and mild heat)
- 1/2 cup chopped onion
- 1/2 cup bell pepper, chopped (any color)
- 1/2 cup grated cheddar cheese
- 1/2 cup grated mozzarella cheese
- 1/4 teaspoon garlic powder
- Salt and freshly ground black pepper, to taste
- 2 tablespoons olive oil (for sautéing)
Notes: shredded rotisserie chicken saves time. If using leftover chicken with low moisture, you may need a splash more broth. For vegetarians, swap chicken for canned white beans or extra mushrooms.
Step-by-step instructions
- Preheat the oven to 350°F (175°C). Grease a 9×13-inch baking dish with oil or nonstick spray.
- Bring a large pot of salted water to a rolling boil. Add the spaghetti and cook 1–2 minutes less than the package recommends (about 8–9 minutes) so it’s just al dente. Drain and set aside.
- Warm 2 tablespoons olive oil in a skillet over medium heat. Add the chopped onion and bell pepper. Sauté 4–6 minutes until softened and slightly translucent. Season lightly with salt and pepper.
- In a large mixing bowl, combine the drained spaghetti, shredded chicken, chicken broth, cream of mushroom soup, diced tomatoes with green chiles, sautéed vegetables, garlic powder, and several grinds of black pepper. Stir until everything is evenly coated and saucy. Taste and adjust salt/pepper.
- Transfer the mixture to the prepared baking dish and spread into an even layer. Sprinkle the grated cheddar and mozzarella evenly over the top.
- Bake about 25 minutes, until cheese is bubbly and edges are bubbling. For a deeper golden top, broil on high 1–3 minutes — watch closely so it doesn’t burn.
- Remove from the oven and rest 5 minutes before serving to let the casserole set slightly.
Best ways to enjoy it
This casserole is hearty on its own but shines with crisp, fresh sides that cut the richness. Serve with:
- A simple green salad tossed with lemon vinaigrette.
- Roasted or steamed green beans, broccoli, or a medley of seasonal vegetables.
- A spoonful of pickled onions or a squeeze of lime for brightness.
And if you’re hosting a casual spread, serve alongside sliders or finger foods — for more party sandwich ideas try these buffalo chicken sliders which offer a tangy contrast.
Storage and reheating tips
- Refrigeration: Store leftovers in an airtight container for 3–4 days.
- Freezing: Cool completely, then freeze in a shallow, airtight container for up to 3 months. Thaw overnight in the fridge before reheating.
- Reheating (oven): Preheat to 350°F (175°C). Cover casserole with foil and bake until heated through, about 20–25 minutes (longer if frozen). Internal temperature should reach 165°F (74°C) for safety.
- Reheating (microwave): Portion into a microwave-safe dish. Heat on medium power in 1–2 minute bursts, stirring in between, until hot throughout.
Tip: Add a splash of broth or milk when reheating to loosen sauce if it’s thickened.
Pro chef tips
- Undercook your pasta slightly: it finishes cooking in the oven and absorbs sauce better.
- Use a high-quality shredded chicken (rotisserie is ideal) for moist texture and deep flavor.
- Drain tomatoes well if they’re very watery, or reduce the broth by 1/4 cup to avoid a soupy bake.
- Layer cheeses: put a little cheese mixed into the pasta and reserve the rest for the top for better melting and browning.
- Watch the broiler: it goes from golden to burnt fast; keep the oven door slightly ajar and an eye on it.
- Make it ahead: assemble the casserole, cover, refrigerate, and bake when ready (add 10–15 minutes to baking time if cold from fridge).
Creative twists
- Spicy: add diced jalapeño or a teaspoon of chipotle in adobo to the mix.
- Vegetarian: swap shredded chicken for sautéed mushrooms and white beans; use vegetable broth.
- Creamier: stir in 1/2 cup sour cream or cream cheese into the sauce before baking.
- Different cheeses: try pepper jack for heat, Gruyère for nuttiness, or Parmesan for sharper flavor.
- Low-carb: swap spaghetti for spiralized zucchini or shirataki noodles (adjust bake time and moisture).
- Topping upgrade: mix panko with melted butter and a sprinkle of Parmesan for a crunchy crust.
Common questions
Q: How long does this casserole take from start to finish?
A: Active prep is about 15–20 minutes (pasta, sauté, mix). Bake time is around 25 minutes, so plan on roughly 45 minutes total.
Q: Can I use raw chicken instead of cooked?
A: You can, but it requires adjusting the process. Poach or bake the chicken separately until it reaches 165°F (74°C), shred it, then add to the casserole. If you add raw pieces directly, the casserole may overcook the pasta before the chicken is safe.
Q: Is this freezer-friendly?
A: Yes. Cool completely, freeze up to 3 months. Thaw overnight and reheat covered at 350°F until hot throughout.
Q: Can I reduce the canned soup or broth to make it lighter?
A: Yes — reduce the broth by 1/4 cup or use a lighter soup (or a mixture of milk and a smaller amount of soup) to adjust richness and thickness.
Q: How can I make this less spicy for kids?
A: Use plain diced tomatoes instead of the tomatoes with green chiles, and omit any added chilies or pepper jack cheese.
If you want more casserole-style or easy chicken recipes, check the rest of the site for inspiration and similar crowd-pleasers.
Print
Chicken Spaghetti Casserole
- Total Time: 45 minutes
- Yield: 4 servings
- Diet: Gluten-free, Dairy-free (if using alternatives)
Description
A cozy and budget-friendly chicken spaghetti casserole topped with gooey cheese, perfect for weeknights or potlucks.
Ingredients
- 8 oz spaghetti (regular or gluten-free)
- 2 cups cooked chicken, shredded (rotisserie or poached)
- 2 cups chicken broth
- 1 can (10.5 oz) cream of mushroom soup
- 1 cup diced tomatoes with green chiles
- 1/2 cup chopped onion
- 1/2 cup bell pepper, chopped (any color)
- 1/2 cup grated cheddar cheese
- 1/2 cup grated mozzarella cheese
- 1/4 teaspoon garlic powder
- Salt and freshly ground black pepper, to taste
- 2 tablespoons olive oil (for sautéing)
Instructions
- Preheat the oven to 350°F (175°C). Grease a 9×13-inch baking dish with oil or nonstick spray.
- Bring a large pot of salted water to a rolling boil. Add the spaghetti and cook 1–2 minutes less than the package recommends (about 8–9 minutes) so it’s just al dente. Drain and set aside.
- Warm 2 tablespoons olive oil in a skillet over medium heat. Add the chopped onion and bell pepper. Sauté 4–6 minutes until softened and slightly translucent. Season lightly with salt and pepper.
- In a large mixing bowl, combine the drained spaghetti, shredded chicken, chicken broth, cream of mushroom soup, diced tomatoes with green chiles, sautéed vegetables, garlic powder, and several grinds of black pepper. Stir until everything is evenly coated and saucy. Taste and adjust salt/pepper.
- Transfer the mixture to the prepared baking dish and spread into an even layer. Sprinkle the grated cheddar and mozzarella evenly over the top.
- Bake about 25 minutes, until cheese is bubbly and edges are bubbling. For a deeper golden top, broil on high 1–3 minutes — watch closely so it doesn’t burn.
- Remove from the oven and rest 5 minutes before serving to let the casserole set slightly.
Notes
Shredded rotisserie chicken saves time. If using leftover chicken with low moisture, you may need a splash more broth. For vegetarians, swap chicken for canned white beans or extra mushrooms.
- Prep Time: 15 minutes
- Cook Time: 25 minutes
- Category: Main Course
- Method: Baking
- Cuisine: American