Cheesy French Onion Meatloaf in a Cast Iron Skillet Step-by-step instructions

Before you start

Before starting, measure out all the ingredients and slice the yellow onions thinly and evenly to ensure they caramelize at the same rate. Measure the reduced beef stock and shred the Gruyere cheese.

Ensure the ground beef is kept refrigerated until the exact moment you are ready to mix, keeping the fat cold for a lighter texture. Having all your components prepped and ready to go ensures a smooth transition from the stovetop caramelization to the oven baking phase.

Instructions

Onion Caramelization and Base Prep

1. 1Caramelize the Onions
   Cook the sliced yellow onions in a skillet over medium heat, stirring occasionally, until they turn deeply golden brown and caramelized, about 20 minutes. Remove half of the caramelized onions from the skillet and set them aside to top the meatloaf later.
   Look for The onions should be soft, sweet, and rich amber in color.
   Tip Cook them low and slow to prevent burning.
2. 2Mix the Meatloaf Base
   In a mixing bowl, combine the ground beef with the remaining caramelized onions left in the skillet. Mix gently with your hands just until the onions are evenly distributed throughout the beef, being careful not to overwork the meat.
   Look for The mixture should hold together without being overly sticky.
   Tip Ensure the caramelized onions have cooled slightly before mixing.

At the end of this phase, the sliced yellow onions will have transformed from pale and crunchy to a deep, rich amber color, filling the kitchen with a sweet, savory aroma. The onions should be incredibly soft and caramelized, and half of them will be safely folded into the cold ground beef mixture. The beef mixture should hold its shape well when gently pressed, ready to be formed into a uniform oval loaf in the skillet.

Skillet Baking and Basting

3. 3Form and Glaze the Loaf
   Preheat the oven to 375°F (190°C). Shape the beef mixture into an oval loaf and place it into a cast iron skillet. Pour the rich reduced beef stock over the top of the meatloaf, coating it evenly to ensure it stays moist during baking.
   Look for The loaf should sit comfortably in the center of the skillet.
   Tip Tuck the edges of the loaf neatly to ensure even cooking.
4. 4Bake the Meatloaf
   Bake the meatloaf in the preheated oven for 45 minutes. Periodically spoon the warm reduced beef stock from the bottom of the skillet back over the top of the loaf. Ensure the internal temperature reaches 160°F (71°C) to safely cook the ground meat.
   Look for The meatloaf should be firm to the touch and browned on the outside.
   Safe temperature 160°F (71°C) internal temperature (ground meat)
   Tip Use an instant-read thermometer inserted into the thickest part.

By the end of the baking cycle, the meatloaf will be firm, beautifully browned on the outside, and sitting in a shallow pool of rich, bubbling reduced beef stock.

The internal temperature must register a safe 160°F (71°C) on a meat thermometer, confirming the beef is fully cooked through. The glaze should be slightly reduced and cling to the sides of the meatloaf, giving it a rich, glossy appearance before the cheese is added.

Cheese Melting and Resting

5. 5Melt the Gruyere Topping
   Top the baked meatloaf with the reserved caramelized onions and a generous layer of shredded Gruyere cheese. Return the skillet to the oven for 5 minutes, or place it under the broiler, until the cheese is completely melted, bubbly, and golden brown.
   Look for The cheese should be fully melted and bubbling vigorously.
   Tip Watch closely under the broiler to prevent burning.
6. 6Garnish and Rest
   Remove the hot skillet from the oven. Garnish the melted cheese with the chopped fresh parsley. Let the meatloaf rest in the skillet for 10 minutes before slicing to allow the juices to redistribute and the cheese to set.
   Look for The resting meatloaf will absorb some of the remaining savory pan juices.
   Tip Resting prevents the slices from falling apart when cut.

At the final checkpoint, the Gruyere cheese will be completely melted, forming a thick, bubbly, golden-brown blanket over the meatloaf. The fresh green parsley will provide a vibrant color contrast, and the meatloaf will rest quietly, absorbing the remaining savory pan juices for maximum juiciness. When sliced, the meatloaf should hold its shape perfectly, revealing a moist interior flecked with sweet caramelized onions.

Common mistakes

One common mistake is overworking the meat mixture when combining the ingredients. Handling the ground beef too much compresses the meat, resulting in a dense, tough meatloaf. Mix gently with your hands just until the onions are incorporated.

Another mistake is skipping the resting period; cutting into the meatloaf immediately will cause all the delicious juices to run out, leaving the meat dry. Additionally, make sure not to slice the onions too thick, or they will not caramelize evenly.

How to tell it’s done

To guarantee the meatloaf is perfectly cooked and safe to eat, insert an instant-read meat thermometer into the thickest part of the loaf. The internal temperature must reach 160°F (71°C) to ensure the ground meat is fully cooked.

The exterior should be deeply browned, and the cheese topping should be fully melted, bubbly, and lightly golden around the edges. Let the meatloaf rest for ten minutes after baking to allow the juices to lock into the meat before slicing.

• Ground meat: 160°F (71°C) in the thickest part