Begin by slicing the onions thinly, then place them in a large skillet over low heat. Add a bit of oil or butter and cook for 20-25 minutes, stirring occasionally, until they are beautifully golden and caramelized.

In a large mixing bowl, combine the ground beef, the caramelized onions you just made, eggs, breadcrumbs, and milk or broth. Sprinkle in your chosen seasonings, then mix gently until well combined.

Shape the meat mixture into a loaf and place it in a greased baking dish, ensuring the loaf is even in thickness.

Generously sprinkle shredded cheese over the top of the formed meatloaf, pressing down gently to ensure the cheese sticks.

Preheat your oven to 375°F (190°C) and bake the meatloaf for 50-60 minutes, checking doneness with a meat thermometer.

Let the meatloaf rest for about 10 minutes after removing it from the oven.

Slice the meatloaf into individual servings and serve warm.