French Onion Meatballs

 French onion meatballs capture the flavor of the iconic soup in a new, fun-to-eat dish. Sweet and tender onions flavor the meatballs and the sauce, and a sprinkle of Gruyere makes this recipe extra special.

French onion soup is hearty enough for a cold winter’s day but still light enough to enjoy any time of year. This recipe distills the essence of the iconic soup into a sauce for tender meatballs. 

But it’s not just the sauce that harkens to French onion soup—the meatballs themselves are packed full of sweet and savory onion flavor. You can serve French onion meatballs on their own for a crowd-pleasing party snack, but a healthy shower of Gruyere cheese and some crusty bread turns this dish into a meal. 

The Key Ingredient: Onions

The humble onion does a magic trick as it cooks; initially sharp and strong, it develops into a silky, golden, sweet ingredient when patiently cooked over low heat. Low and slow-cooked onion adds complexity to so many dishes. 

For this recipe, we’re not quite caramelizing (which involves taking them to a deep brown color), but still developing tons of flavor, particularly with the additions of thyme, bay leaves, and wine. Half of the flavorful onions are added to the meatballs, while the other half are added to the sauce.

The Best Beef for French Onion Meatballs

To ensure your French onion sauce doesn’t become too heavy or oily, be sure to buy lean ground beef for these meatballs. You’re adding cheese and butter at various points in the recipe, so there won’t be a lack of richness (and deliciousness!). 

If you’re feeling adventurous, substitute the ground beef for ground lamb. Or try ground chicken for a lighter version of the dish—just be sure to use ground chicken that contains both white meat and dark meat to prevent the mixture from becoming dry. 

The Finishing Touches

If you’re aiming to emulate the French, the best cheese to use in this dish is a nutty Gruyere. It’s fairly widely available (try the specialty cheese or deli section of your supermarket), but if you can’t find a block to grate, a few thin slices are fine too—layer them over the meatballs and broil for a bit longer to melt. 

And what better bread to serve alongside this dish than the famed French baguette? Cut slices for a party or tear it casually for dinner. Give the bread a light toast for maximum crunchy contrast. My favorite trick is to rub the bread with a garlic clove while it’s still warm for instant garlic bread. 

How to Store and Reheat

Refrigerate the cooked meatballs with the French onion sauce for up to 5 days. Reheat gently on the stovetop or in the microwave.

The meatballs can also be frozen uncooked: freeze the shaped meatballs on a parchment-lined tray until solid, then transfer to a freezer container and store for up to 3 months. Thaw in the fridge before cooking and continuing on with the recipe.

Ingredients

For the onions

• 2 tablespoons olive oil
• 4 medium yellow onions, thinly sliced (about 6 cups)
• 3 cloves garlic, thinly sliced
• 2 bay leaves
• 1 1/2 teaspoons kosher salt
• 1 teaspoon fresh thyme leaves
• 1/2 teaspoon freshly ground black pepper
• 1/3 cup dry white wine, such as sauvignon blanc
• 2 tablespoons unsalted butter

For the meatballs

• 1 pound 90% lean ground beef
• 1 large egg, beaten
• 1/3 cup panko breadcrumbs
• 1 teaspoon kosher salt
• 1/2 teaspoon freshly ground black pepper
• 2 tablespoons olive oil

For the sauce and serving

• 1 tablespoon all-purpose flour
• 2 cups low-sodium chicken broth
• 1 teaspoon Dijon mustard
• 1 teaspoon Worcestershire sauce
• 6 ounces freshly grated Gruyere cheese (about 1 cup)
• Toasted baguette slices, for serving