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French Onion Meatball Skillet

French onion meatball skillet with deeply caramelized onions, simmered beef meatballs, and a Gruyère blanket that turns golden and bubbly under the broiler. Built in one oven-safe skillet for a rich, saucy texture with savory, browned edges.
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Prep Time 20 minutes
Cook Time 45 minutes
Total Time 1 hour 5 minutes
Servings: 4 servings
Course: Main Dish
Cuisine: French-American
Calories: 650
Ingredients Equipment Method Notes

Ingredients
  

For meatballs
  • 1 lb ground beef
  • 0.25 cup breadcrumbs
  • 1 egg
  • 1 tbsp Worcestershire
  • 1 tsp garlic powder
  • 0.25 salt to taste
  • 0.25 pepper to taste
For French onion base
  • 3 onions large, thinly sliced
  • 4 tbsp butter
  • 2 cloves garlic minced
  • 0.5 cup dry white wine
  • 1.5 cup beef broth
  • 1 tbsp Worcestershire
  • 1 tbsp fresh thyme
  • 2 cup Gruyere shredded
  • 0.25 salt to taste
  • 0.25 pepper to taste

Equipment

  • 1 cast iron skillet

Method
 

Make the meatballs
  1. In a mixing bowl, combine ground beef, breadcrumbs, egg, Worcestershire, garlic powder, salt, and pepper until evenly mixed; roll into meatballs. Keep them similar in size so they brown at the same pace.
  2. Heat butter in an oven-safe skillet over medium heat and brown the meatballs in batches as needed, turning until golden all over. Remove browned meatballs to a plate.
Caramelize the onions and build the sauce
  1. Reduce heat to medium-low and cook the sliced onions in the same skillet until deeply caramelized, about 30-35 minutes, stirring occasionally. Look for thick, dark amber onions and no raw onion smell.
  2. Add minced garlic and fresh thyme to the onions and cook for about 1 minute until fragrant. Stir constantly so the garlic doesn’t brown too fast.
  3. Pour in the dry white wine to deglaze, scraping up the browned bits from the bottom of the skillet. Cook for 1-2 minutes until the wine smell mellows.
  4. Add beef broth and Worcestershire, then bring the sauce to a gentle simmer. Taste and adjust with salt and pepper.
Simmer, top, and broil
  1. Nestle the browned meatballs into the caramelized onion sauce and simmer for 10 minutes. You should see light bubbling around the edges.
  2. Scatter Gruyere over the entire surface so it covers the meatballs and sauce. Broil for 3-5 minutes until the cheese is golden and bubbly.

Notes

Pro tip: caramelize the onions slowly on medium-low for the full 30-35 minutes for maximum depth—rushing makes the base taste flat. Store leftovers in the refrigerator up to 3 days in an airtight container; reheat gently in a skillet or microwave until hot. Freezing is not recommended because the onions and cheese can lose texture after thawing. For a lower-fat swap, use 90% lean ground beef and reduce butter by 1 tablespoon.