Go Back

Slow Cooker Meatballs

These slow cooker meatballs skip the browning step entirely — and that's the secret. Gentle, low heat keeps the beef tender and juicy all the way through, while hours of simmering in marinara builds a rich, deeply flavored sauce. The result is plump, perfectly intact meatballs that are softer and more yielding than anything made on the stovetop.
Print Recipe Pin Recipe
Prep Time 20 minutes
Cook Time 3 hours
Servings: 6
Course: Main Course
Cuisine: Italian
Calories: 380
Ingredients Equipment Method Notes

Ingredients
  

For the Meatballs
  • 1½ lbs 680g 80% lean ground beef
  • 1 large egg lightly beaten
  • ½ cup Italian-seasoned breadcrumbs
  • ½ cup finely minced yellow onion
  • ⅓ cup freshly grated Parmesan cheese
  • 2 garlic cloves minced
  • 1 tsp salt
  • ½ tsp black pepper
  • 1 tsp dried Italian seasoning
For the Sauce
  • 56 oz approx. two 28-oz jars good-quality marinara sauce

Equipment

  • 6-quart slow cooker
  • Large mixing bowl
  • Instant-read meat thermometer
  • Medium cookie scoop (optional, for uniform meatballs)
  • Rimmed baking sheet (if prepping ahead)

Method
 

  1. Mix the meatball ingredients. Combine the ground beef, beaten egg, breadcrumbs, minced onion, Parmesan, garlic, salt, pepper, and Italian seasoning in a large bowl. Use your hands to mix until everything is just combined — do not overwork the mixture. The mixture will look slightly rough and that is correct.
  2. Form the meatballs. Roll the mixture into balls approximately 1½ inches in diameter (about the size of a golf ball). You should get around 24 meatballs. For perfectly even meatballs, use a medium cookie scoop.
  3. Layer in the slow cooker. Pour about one-third of the marinara sauce into the bottom of the slow cooker. Arrange the meatballs in a single layer (or stacked if needed), then pour the remaining sauce over the top to fully cover them.
  4. Do not stir. Leave the slow cooker undisturbed — stirring before the meatballs have set is the most common reason they fall apart. The sauce will naturally seep down around the meatballs as the cooker heats up.
  5. Cook on HIGH for 2½ to 3 hours, or on LOW for 5 to 6 hours. Avoid lifting the lid during cooking as this releases heat and extends the cook time.
  6. Check for doneness. Use an instant-read thermometer to check the internal temperature of the largest meatballs in the center of the slow cooker. They are done when they reach 160°F (71°C). Do not rely on color alone, as the acidic sauce can affect how the meat looks inside.
  7. Serve immediately over spaghetti with plenty of the cooking sauce, as meatball subs, or straight from the slow cooker set to 'Warm' as an appetizer with toothpicks.

Notes

Meat blend: For richer, more complex meatballs, substitute with equal parts ground beef, ground pork sausage, and ground veal. For a leaner option using turkey or chicken, add an extra tablespoon of olive oil to prevent dryness.
Make ahead: Form the meatballs the night before, arrange on a rimmed baking sheet, cover, and refrigerate overnight. Add an extra 20 minutes to the cook time since they'll be starting cold.
Doubling the recipe: Stack a second layer of meatballs and pour remaining sauce over the top. Add 20 extra minutes to the cook time. A double batch (3 lbs beef) comfortably serves 10–12 alongside 2 lbs of cooked pasta.
Storage: Refrigerate in an airtight container with sauce for up to 3 days. Freeze for up to 3 months thaw overnight in the fridge and reheat gently on the stovetop.
Sauce quality matters: Because the meatballs absorb the sauce throughout cooking, choose a good-quality marinara made with simple ingredients and no added sugar.