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5 from 1 vote

Slow Cooker Mozzarella-Stuffed Meatballs

These mozzarella stuffed meatballs are easy, comforting and healthy. Packed with delicious veggies and all made in the slow cooker, it couldn't be easier!
Course Main Course
Cuisine American
Keyword Cheese Stuffed Meatballs, Mozzarella Stuffed Meatballs, slow cooker meatballs
Prep Time 30 minutes
Cook Time 5 hours
Total Time 5 hours 30 minutes
Servings 8 (24 total meatballs)
Calories 253kcal
Author The Seasoned Mom


For the Meatballs:

  • 1.5 lb. ground beef I used 93% lean
  • 1 large egg beaten
  • 2 tablespoons milk
  • 2 tablespoons grated Parmesan cheese
  • ¾ teaspoon salt
  • ¼ teaspoon garlic powder
  • ¼ teaspoon pepper
  • 2 teaspoons Italian seasoning
  • 1 log 8 ounces fresh mozzarella cheese, or if you can find them I like to use the fresh mozzarella snacking cheese balls because they’re already shaped in exactly the right size – it’s an easy shortcut!

For the Sauce:

  • 2 carrots grated
  • 1 small onion finely chopped
  • 1 red bell pepper finely chopped
  • 1 8 ounce package sliced mushrooms
  • 1 6 ounce can tomato paste
  • 1 cup beef broth
  • 1 cup marinara sauce homemade or from a jar
  • 1 teaspoon salt
  • ½ teaspoon oregano
  • ½ teaspoon basil


  • Place vegetables (carrots, onion, bell pepper, and mushrooms) in bottom of slow cooker.
  • In a large bowl, use hands to gently combine first 8 meatball ingredients (beef through Italian seasoning). Cut mozzarella into small cubes (about ½-inch diameter). Mold meat mixture around each piece of cheese to form round balls.
  • Place raw meatballs on top of vegetables in the slow cooker.
  • In a separate bowl, combine tomato paste, broth, marinara, salt, oregano, and basil. Pour over meatballs.
  • Cover and cook on low for 4-6 hours. Give everything a good stir and serve over pasta, zucchini noodles, or in hoagie rolls!


Calories: 253kcal | Carbohydrates: 11g | Protein: 27g | Fat: 11g | Saturated Fat: 4g | Cholesterol: 84mg | Sodium: 1066mg | Potassium: 837mg | Fiber: 2g | Sugar: 6g | Vitamin A: 3525IU | Vitamin C: 28.3mg | Calcium: 162mg | Iron: 3.6mg