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Slow Cooker French Onion Meatballs

These Slow Cooker French Onion Meatballs are the easiest comfort food ever—just 4 ingredients! Frozen meatballs simmer in rich French onion soup with caramelized onions and melty Gruyere cheese. Perfect as a main dish or appetizer, they’re hearty, flavorful, and require almost no prep!
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Prep Time 5 minutes
Cook Time 4 hours
Total Time 4 hours 5 minutes
Servings: 6 servings
Course: Appetizer, Main Course
Cuisine: American, Comfort Food
Calories: 420
Ingredients Equipment Method Notes

Ingredients
  

  • 26 oz frozen beef meatballs (homestyle variety recommended)
  • 1 large yellow onion, peeled and thinly sliced
  • 2 cans (10.5 oz each) condensed French onion soup (Campbell’s recommended)
  • 1 cup Gruyere cheese, shredded (freshly shredded for best melting)

Equipment

  • 6-quart slow cooker
  • Sharp knife
  • Cutting Board
  • Mixing Spoon

Method
 

  1. Place the frozen meatballs directly into your slow cooker. No need to thaw—this recipe is designed for frozen meatballs.
  2. Add the thinly sliced onion and both cans of condensed French onion soup over the meatballs.
  3. Stir to evenly coat the meatballs with soup and distribute the onions. Cover and cook on LOW for 3–4 hours or HIGH for 1–2 hours, stirring occasionally.
  4. In the final 15–30 minutes, sprinkle shredded Gruyere cheese on top. Replace lid and continue cooking until melted and bubbly.
  5. Serve hot over mashed potatoes, rice, or toasted bread. Spoon plenty of French onion sauce over the top for the ultimate comfort food experience.

Notes

Pro Tips: Use plain homestyle meatballs (avoid Italian seasoned). Stir once or twice during cooking to prevent burning. Freshly shredded Gruyere melts best—avoid pre-shredded cheese. If sauce becomes watery, remove lid for last 30 minutes to thicken.
Serving Ideas: Enjoy as an appetizer with toothpicks or serve over mashed potatoes or rice for a hearty main dish. Try piling them on hoagie rolls for French onion meatball subs!

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