French Onion Meatloaf Topped with Caramelized Onions & Cheese

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This French Onion Meatloaf takes classic homemade meatloaf and turns it into an irresistibly rich comfort-food dinner. Tender, seasoned ground beef is baked until juicy, topped with melted cheese, and finished with golden caramelized onions that add a deep, sweet-savory flavor to every slice.

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The combination of beef, slowly caramelized onions, herbs, and melted cheese creates the comforting flavors of French onion soup in a hearty main dish. Served with mashed potatoes, roasted vegetables, or a simple green salad, this meatloaf makes a satisfying family dinner that feels both familiar and special.

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Why You’ll Love This French Onion Meatloaf

  • Juicy and tender: Breadcrumbs, milk, and egg help keep the meatloaf moist while it bakes.
  • Deep caramelized onion flavor: Slowly cooked onions develop a naturally sweet and savory taste.
  • Melted cheesy topping: Gooey cheese adds richness and creates an irresistible golden finish.
  • Classic comfort food: It has all the warmth of traditional meatloaf with an elevated French onion twist.
  • Great for leftovers: Slices reheat well and are delicious in sandwiches the next day.

Ingredients

For the Meatloaf:

  • 2 lb ground beef, preferably 80–85% lean
  • 1 medium yellow onion, finely diced
  • 3 cloves garlic, minced
  • 1 cup breadcrumbs
  • ½ cup whole milk
  • 1 large egg
  • 2 tbsp Worcestershire sauce
  • 1 tbsp Dijon mustard
  • 1 tsp dried thyme
  • 1 tsp dried parsley
  • 1 tsp kosher salt
  • ½ tsp freshly ground black pepper
  • ½ tsp smoked paprika

For the Caramelized Onion Topping:

  • 3 large yellow onions, thinly sliced
  • 2 tbsp unsalted butter
  • 1 tbsp olive oil
  • ½ tsp kosher salt
  • ½ tsp dried thyme
  • ¼ tsp black pepper
  • ½ cup beef broth
  • 1 tsp Worcestershire sauce

For the Cheese Topping:

  • 1½ cups shredded Gruyère cheese
  • ½ cup shredded mozzarella cheese
  • 1 tbsp chopped fresh thyme or parsley

Instructions

  1. Preheat the oven: Preheat your oven to 375°F (190°C). Line a baking sheet with parchment paper or lightly grease a loaf pan.
  2. Prepare the meatloaf mixture: In a large bowl, combine the ground beef, finely diced onion, garlic, breadcrumbs, milk, egg, Worcestershire sauce, Dijon mustard, thyme, parsley, salt, black pepper, and smoked paprika.
  3. Mix gently: Using clean hands or a wooden spoon, mix everything just until evenly combined. Avoid overmixing because this can make the meatloaf dense.
  4. Shape the meatloaf: Transfer the mixture to the prepared baking sheet and shape it into a compact loaf approximately 8–9 inches long and 4–5 inches wide. If using a loaf pan, press the mixture in gently without packing it too tightly.
  5. Bake the meatloaf: Place the meatloaf in the preheated oven and bake for approximately 40–45 minutes.
  6. Caramelize the onions: While the meatloaf cooks, heat the butter and olive oil in a large skillet over medium-low heat. Add the sliced onions and salt. Cook slowly for 25–35 minutes, stirring every few minutes, until the onions become deeply golden, soft, and caramelized.
  7. Deglaze the onions: Add the beef broth, Worcestershire sauce, thyme, and black pepper to the caramelized onions. Stir well and cook for another 3–5 minutes, allowing the liquid to reduce and coat the onions with a rich savory glaze.
  8. Check the meatloaf: Remove the meatloaf from the oven when the center reaches approximately 160°F (71°C). The temperature will rise slightly as it rests.
  9. Add the cheese: Spread the caramelized onions evenly over the top of the meatloaf. Sprinkle the Gruyère and mozzarella over the onions, covering the surface generously.
  10. Return to the oven: Place the meatloaf back into the oven and bake for another 8–10 minutes, until the cheese is completely melted and bubbling.
  11. Brown the topping: For a beautifully golden cheese crust, switch the oven to broil and broil for 1–2 minutes, watching closely so the cheese doesn’t burn.
  12. Rest the meatloaf: Remove the meatloaf from the oven and allow it to rest for 10–15 minutes before slicing. This helps the juices redistribute and keeps the slices together.
  13. Garnish and serve: Sprinkle the top with fresh thyme or parsley. Slice the meatloaf into thick portions and serve warm with mashed potatoes, roasted vegetables, or a crisp green salad.

Tips for the Best French Onion Meatloaf

  • Don’t rush the onions: Low and slow cooking creates the deep caramelized flavor that makes this meatloaf special.
  • Don’t overmix the beef: Mix just until the ingredients are incorporated to keep the meatloaf tender.
  • Use 80–85% lean beef: A moderate amount of fat helps create a juicy, flavorful meatloaf.
  • Use Gruyère for the best flavor: Its nutty, savory character pairs beautifully with caramelized onions.
  • Use a thermometer: Cook the center to 160°F (71°C) for a properly cooked meatloaf.
  • Let it rest: Resting for 10–15 minutes makes the meatloaf easier to slice and helps retain its juices.
  • Broil carefully: The cheese can brown very quickly under the broiler, so keep a close eye on it.
  • Save extra onions: Any leftover caramelized onions are delicious served alongside mashed potatoes, burgers, or steak.

Nutrition (per serving, serves 6)

Calories: ~560 | Protein: 38g | Carbohydrates: 27g | Fat: 34g | Fiber: 2g | Sodium: ~920mg

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