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Crock Pot Spaghetti Casserole Recipe

Course: Dinner
Cuisine: Italian
Prep Time: 15 minutes
Cook Time: 4 hours
Total Time: 4 hours 15 minutes
Servings: 6 servings
Calories: 711kcal
Author: Becky Hardin
Throw sauce, pasta, and all the ingredients in the slow cooker and out comes a cheesy spaghetti casserole!
Print Recipe


  • 2 teaspoons olive oil
  • 1 pound ground beef
  • 1 pound ground Italian sausage
  • 1 cup onion diced
  • 3 cloves garlic minced
  • 24 ounces marinara sauce 1 standard jar
  • 1 cup water
  • 14 ounces diced tomatoes 1 standard can
  • 2 teaspoons Italian seasoning
  • ½ teaspoon kosher salt
  • ¼ teaspoon black pepper
  • Pinch granulated sugar
  • 8 ounces spaghetti noodles broken into thirds
  • 1 ½ cups shredded mozzarella


  • In a large skillet set over medium-high heat, heat oil. Add ground beef, sausage, and onion and cook 5-6 minutes, until beef is cooked through, crumbling with a spoon as you cook. Drain any excess grease and return it to the skillet.
    2 teaspoons olive oil, 1 pound ground beef, 1 pound ground Italian sausage, 1 cup onion
    ground beef in a frying pan.
  • Add the garlic and cook for 1 minute, until fragrant. Stir in the marinara sauce, pouring the water into the jar and swishing it around to remove any excess sauce, then add that to the skillet. Add diced tomatoes, Italian seasoning, salt, pepper, and sugar, stirring to combine.
    3 cloves garlic, 24 ounces marinara sauce, 14 ounces diced tomatoes, 2 teaspoons Italian seasoning, ½ teaspoon kosher salt, ¼ teaspoon black pepper, Pinch granulated sugar, 1 cup water
    a skillet full of tomato sauce with meat in it.
  • Transfer the mixture to the crock of a 6-quart slow cooker.
    a crock pot filled with chili and meat.
  • Top with broken spaghetti and stir together.
    8 ounces spaghetti noodles
    a crock pot full of spaghetti and meatballs.
  • Top with mozzarella, cover, and cook on low for 4 hours.
    1 ½ cups shredded mozzarella
    a crock pot filled with cheese and meat.
  • Serve garnished with grated Parmesan and fresh parsley or basil.
    a crock pot filled with lasagna and cheese.



  • Long pasta like spaghetti or linguini work great in this recipe, but you can use shorter pasta like penne or fusilli.
  • I made this with my favorite marinara sauce, but any pasta sauces will work great.
  • Once cooked, you can keep the spaghetti warm in the slow cooker for up to 2 hours.


Calories: 711kcal | Carbohydrates: 41g | Protein: 38g | Fat: 44g | Saturated Fat: 16g | Polyunsaturated Fat: 4g | Monounsaturated Fat: 18g | Trans Fat: 1g | Cholesterol: 130mg | Sodium: 1507mg | Potassium: 1051mg | Fiber: 4g | Sugar: 9g | Vitamin A: 827IU | Vitamin C: 17mg | Calcium: 226mg | Iron: 5mg