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Crockpot French Onion Meatballs

Crockpot French Onion Meatballs

These Crockpot French Onion Meatballs are rich, savory, and irresistibly cheesy — the perfect blend of classic French recipes and hearty comfort food recipes. Juicy meatballs simmer slowly in caramelized onion gravy for a cozy, restaurant-quality meal that’s effortless to make. Ideal for meatball dinner ideas, weeknight meals, or party meatballs crockpot style!
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Prep Time 15 minutes
Cook Time 6 hours
Total Time 6 hours 15 minutes
Servings: 4
Ingredients Method Notes

Ingredients
  

  • For the Meatballs:
  • 1½ lbs 680 g ground beef
  • ½ cup breadcrumbs
  • 1 large egg
  • 2 cloves garlic minced
  • ½ tsp onion powder
  • ½ tsp salt
  • ¼ tsp black pepper
  • 1 tbsp Worcestershire sauce
  • For the French Onion Sauce:
  • 2 large yellow onions thinly sliced
  • 3 tbsp butter
  • 1 tbsp olive oil
  • 2 cups beef broth
  • 1 tbsp Worcestershire sauce
  • 1 tbsp balsamic vinegar optional
  • 1 tsp fresh thyme or ½ tsp dried thyme
  • 1 cup shredded Gruyère or mozzarella cheese
  • Optional Garnish:
  • Fresh parsley
  • Toasted baguette slices or mashed potatoes for serving

Method
 

  1. Form the Meatballs:
  2. In a mixing bowl, combine ground beef, breadcrumbs, egg, garlic, onion powder, salt, pepper, and Worcestershire sauce. Mix until just combined and roll into 1½-inch meatballs.
  3. Optional Browning Step:
  4. For extra flavor, lightly brown the meatballs in a skillet over medium heat for 3–4 minutes before adding them to the Crockpot.
  5. Caramelize the Onions:
  6. In the same skillet, melt butter with olive oil. Add the sliced onions and cook slowly, stirring often, until soft and golden brown (about 15–20 minutes).
  7. Prepare the Sauce:
  8. Pour the caramelized onions into the Crockpot. Add beef broth, Worcestershire sauce, balsamic vinegar, and thyme. Stir to combine.
  9. Slow Cook:
  10. Gently place the meatballs into the Crockpot, spooning the onion mixture over them.
  11. Cook on LOW for 5–6 hours or HIGH for 3 hours, until meatballs are tender and cooked through.
  12. Add Cheese:
  13. During the last 10 minutes of cooking, sprinkle shredded cheese over the top. Cover and cook until melted and bubbly.
  14. Serve and Enjoy:
  15. Garnish with fresh parsley and serve warm with mashed potatoes, egg noodles, or crusty bread.

Notes

  • Caramelize onions slowly: Don’t rush — this builds the deep French onion flavor.
  • Use Gruyère cheese for that authentic French taste, or mozzarella for a milder option.
  • Deglaze your pan: Add a splash of broth after caramelizing onions to capture all the flavor.
  • Keep it tender: Avoid overmixing the meatball mixture to prevent toughness.
  • Make ahead: Prep meatballs and onions the night before, refrigerate, and cook the next day.