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Slow Cooker Spaghetti Casserole

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A comforting slow cooker meal featuring tender spaghetti, rich meat sauce, and melty cheese. Perfect for busy days with minimal prep and hands-off cooking.

  • Author: Ella
  • Prep Time: 15 minutes
  • Cook Time: 3 hours
  • Total Time: 3 hours 15 minutes
  • Yield: Serves 6–8
  • Category: Main Dish
  • Method: Slow Cooker
  • Cuisine: Italian-American
  • Diet: Halal

Ingredients

  • 12 oz uncooked spaghetti, broken in half
  • 1 lb ground beef or Italian sausage
  • 1 small onion, chopped
  • 2 cloves garlic, minced
  • 1 can (15 oz) tomato sauce
  • 1 can (14.5 oz) diced tomatoes
  • 2 cups beef broth (or water)
  • 1 tablespoon Italian seasoning
  • ½ teaspoon salt
  • ¼ teaspoon black pepper
  • 1½ cups shredded mozzarella cheese
  • ½ cup grated Parmesan cheese
  • Optional: ½ teaspoon red pepper flakes or 1 chopped bell pepper

Instructions

  1. Brown ground beef in a skillet over medium heat. Drain excess fat.
  2. Add onion and garlic, sauté until softened.
  3. Transfer meat mixture to slow cooker. Stir in tomato sauce, diced tomatoes, broth, seasoning, salt, pepper, and optional ingredients.
  4. Press uncooked spaghetti into sauce. Stir gently to submerge.
  5. Cover and cook on low for 2–3 hours or high for 1–1½ hours until pasta is tender.
  6. About 15 minutes before serving, sprinkle mozzarella and Parmesan over top. Cover again to melt cheese.
  7. Stir gently before serving to mix cheese and pasta evenly.

Notes

  • Swap meat for turkey, sausage, or plant-based options.
  • Add bell peppers, mushrooms, or zucchini for extra veggies.
  • Swirl in ricotta or cream cheese for a creamy twist.
  • Use gluten-free or whole-wheat spaghetti to suit dietary needs.
  • Freeze leftovers for up to 2 months; thaw before reheating.

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