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3.86 from 7 votes

Leftover Spaghetti Casserole

Do you have a ton of leftover spaghetti, again? This Leftover Spaghetti Casserole comes together quickly and easily, can be made with ingredients you have on hand, and is cheesy and delicious!
Prep Time10 mins
Cook Time20 mins
Total Time30 mins
Course: Entree
Cuisine: American
Keyword: leftover casserole recipe, leftover pasta
Servings: 6
Calories: 625kcal
Author: Bernadette Martin


  • 1 1/2 pounds cooked angel hair pasta or thin spaghetti
  • 1 1/4 pounds extra lean ground beef
  • 23 ounces marinara sauce
  • 10 slices mozzarella cheese
  • 8 slices American cheese
  • 2 tablespoons olive oil
  • 1/2 tablespoon onion powder
  • 1 teaspoon garlic powder
  • 1/8 teaspoon black pepper
  • Cooking spray


  • Preheat the oven to 400 degrees F. Spray a large casserole dish (at least 2 1/2 quarts) with cooking spray.
  • Heat the olive oil in a large pan over medium high heat. Cook the ground beef until completely browned, drain if necessary, then stir in the onion powder, garlic powder, and black pepper.
  • Place half of the pasta in the greased casserole dish, top with half of the cheese slices, then half of the sauce. Spread the sauce evenly. Repeat with another layer. Cover with aluminum foil and bake in the preheated oven for 10 minutes.
  • After 10 minutes, remove the casserole dish from the oven, uncover and stir well. Recover and place back in the oven for a least 10 minutes, or until the cheese is melted and bubbly.


Cook time will vary depending on the amount of pasta you have. Adjust the amount of sauce for a much smaller amount of pasta.


Calories: 625kcal | Carbohydrates: 43g | Protein: 43g | Fat: 30g | Saturated Fat: 14g | Cholesterol: 123mg | Sodium: 1397mg | Potassium: 815mg | Fiber: 3g | Sugar: 6g | Vitamin A: 1055IU | Vitamin C: 7.6mg | Calcium: 564mg | Iron: 5.2mg