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Leftover Spaghetti Casserole

Leftover Spaghetti Casserole

I've always believed that the art of cooking lies in making the most out of what you have in your kitchen. Leftover spaghetti, a common occurrence in many households, inspired me to create a dish that's both convenient and irresistibly tasty. This Leftover Spaghetti Casserole is a family favorite, and it's incredibly easy to make. With a few additional ingredients and a dash of creativity, you can turn yesterday's pasta into a delightful meal that everyone will love.
Prep Time 15 minutes
Cook Time 35 minutes
Total Time 50 minutes
Course Main Course
Cuisine American
Servings 6 servings


  • 3 cups leftover spaghetti (cooked)
  • 1 ½ cups pasta sauce
  • 1 cup mozzarella cheese (shredded)
  • ½ cup Parmesan cheese (grated)
  • 2 eggs
  • 1 tsp Italian seasoning
  • ½ tsp red pepper flakes (for a unique kick!)
  • 1 tbsp olive oil


  • Preheat your oven to 375°F (190°C) and grease a baking dish with olive oil.
  • In a large bowl, combine the leftover spaghetti, pasta sauce, mozzarella cheese, and Parmesan cheese. Mix well to ensure the spaghetti is evenly coated.
  • In a separate bowl, beat the eggs and add the Italian seasoning and red pepper flakes. Pour this mixture over the spaghetti and toss until everything is nicely combined.
  • Transfer the spaghetti mixture to the greased baking dish, spreading it out evenly.
  • Bake in the preheated oven for about 35 minutes, or until the top is golden brown and the casserole is bubbling.
  • Allow it to cool for a few minutes before serving. Garnish with fresh basil or parsley if desired.


Cooking Tips for the Best Results:

  1. Use al dente spaghetti: Ensure your leftover spaghetti is not overcooked, as it will continue to cook in the casserole.
  2. Customize your spice level: Adjust the amount of red pepper flakes to your preference for a mild or spicy kick.
  3. Freshly grated cheese: Grate your Parmesan cheese fresh for superior flavor and meltability.
  4. Don’t skip the resting time: Let the casserole sit for a few minutes after baking to allow the flavors to meld together.
  5. Experiment with toppings: Feel free to add your favorite pizza toppings like pepperoni, olives, or bell peppers for extra flavor.

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FAQs about the Leftover Spaghetti Casserole Recipe

Can I use any type of pasta for this casserole?

While spaghetti works best, you can experiment with other pasta shapes, but keep in mind that cooking times may vary.

Can I make this casserole ahead of time?

Absolutely! Prepare it in advance and refrigerate until you’re ready to bake. Just increase the baking time slightly if it’s cold from the fridge.

Can I freeze leftovers?

Yes, you can freeze leftover casserole in an airtight container for up to three months. Reheat in the oven for a fresh taste.

Can I use a different type of cheese?

Sure, feel free to experiment with cheese varieties like cheddar, provolone, or fontina for a unique twist.

What should I serve with this casserole?

A crisp green salad and garlic bread make excellent side dishes to complement the flavors of this casserole.

Related Recipes and Culinary Articles

Read more here for additional info about leftover pasta. Also, I recommend other interesting articles related to this topic, including articles on Leftover Pasta Primavera, Leftover Pasta Frittata, Leftover Spaghetti Salad, Bacon and Leftover Pasta Casserole, Cheesy Leftover Pasta Bake, Leftover Pasta Stir-Fry, Leftover Pasta and Bean Soup, Leftover Pasta with Pesto Sauce, Leftover Creamy Alfredo Pasta with Sun-Dried Tomatoes, and more.

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