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 Spaghetti Casserole?

You need 10 ingredients. The key ingredients include: 1 medium onion, chopped, 1 12 lbs ground beef, 1 green pepper, chopped, 1 (8 ounce) package spaghetti, and more.

Is Spaghetti Casserole suitable as pasta & noodles?

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

How do I store leftover Spaghetti Casserole?

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

Spaghetti Casserole Recipe

Name: Spaghetti Casserole
Prep time: 15 min
Cook time: 30 min
Total time: 45 min
Yield: 4 servings
Ingredients: 1 medium onion, chopped; 1 12 lbs ground beef; 1 green pepper, chopped; 1 (8 ounce) package spaghetti; 2 cans mushrooms or 8 ounces fresh mushrooms; ¼ teaspoon thyme; ¼ teaspoon oregano; ½ teaspoon dried parsley; 2 (14 ounce) cans pizza sauce; 8 -16 ounces balls of scamorozza cheese, depending on how much is desired

Try this homemade Spaghetti Casserole recipe the whole family will love. Made with onion, ground beef, green pepper and mushrooms. Easy step-by-step ins…

This Spaghetti Casserole relies on simple, everyday ingredients such as medium onion, chopped, ground beef, green pepper, chopped and (8 ounce) package spaghetti. It comes together quickly and makes 4 servings, at about 929 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

Feel free to swap in similar ingredients you already have on hand and adjust seasoning to taste.

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

My Personal Notes

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Spaghetti Casserole

Tips for the best results

Variations & substitutions

My Personal Notes

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Frequently Asked Questions