How many servings does this recipe make?

This recipe makes 4 servings. You can adjust the portion size directly on this page.

What ingredients do I need for Hearty Chicken Spaghetti Casserole?

You need 12 ingredients. The key ingredients include: 8 ounces uncooked spaghetti, broken into 3-inch pieces, 3 cups cubed cooked chicken, 1 can (10-3/4 ounces) condensed cream of chicken soup, undiluted, 1 medium onion, chopped, and more.

Is Hearty Chicken Spaghetti Casserole suitable as pasta & noodles?

Yes, Hearty Chicken Spaghetti Casserole falls under the Pasta & Noodles category and is a great choice for this type of meal.

How do I store leftover Hearty Chicken Spaghetti Casserole?

Store leftovers in an airtight container in the refrigerator for up to 3–4 days. Reheat gently before serving.

Hearty Chicken Spaghetti Casserole Recipe

Name: Hearty Chicken Spaghetti Casserole
Prep time: 15 min
Cook time: 30 min
Total time: 45 min
Yield: 4 servings
Ingredients: 8 ounces uncooked spaghetti, broken into 3-inch pieces; 3 cups cubed cooked chicken; 1 can (10-3/4 ounces) condensed cream of chicken soup, undiluted; 1 medium onion, chopped; 1 cup 2% milk; 1 cup shredded sharp cheddar cheese, divided; 1 cup shredded Swiss cheese, divided; 1 can (4 ounces) mushroom stems and pieces, drained; 1/2 cup chopped roasted sweet red peppers; 3 tablespoons mayonnaise; 1-1/2 teaspoons steak seasoning; 1/2 teaspoon dried basil

Try this homemade Hearty Chicken Spaghetti Casserole recipe the whole family will love. Made with chicken, condensed cream, onion and milk. Easy step-by…

This Hearty Chicken Spaghetti Casserole relies on simple, everyday ingredients such as cubed cooked chicken, medium onion, chopped, 2% milk and mayonnaise. It comes together quickly and makes 4 servings, at about 910 kcal each. The step-by-step instructions below are written to be easy to follow, even on a busy day.

It's versatile enough for an easy weeknight dinner yet satisfying enough for guests at the weekend. Serve it with your favorite sides, and keep any leftovers for a quick meal the next day.

Updated Jun 30, 2026

Serves 4 Pasta & Noodles

Tips for the best results

Read through all the steps once before you start and measure out your ingredients first — it makes everything go more smoothly.
Taste as you go and adjust the seasoning before serving.
Avoid overcrowding the pan — cook in batches if needed for the best texture.
Let the dish rest for a few minutes before serving so the flavors settle.
Store leftovers in an airtight container in the fridge and enjoy within a few days.

Variations & substitutions

Coconut cream is a reliable plant-based alternative to dairy cream.

No specific allergen information. Please check the ingredient list for possible allergens.

My Personal Notes

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Hearty Chicken Spaghetti Casserole

Tips for the best results

Variations & substitutions

My Personal Notes

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Frequently Asked Questions