In a large skillet, melt 2 tablespoons of butter over medium heat. Add 2 medium sliced onions and a pinch of salt, cooking for about 20-25 minutes, until the onions are golden brown and fragrant.

In a spacious mixing bowl, combine 1 pound of ground beef, 1 cup of breadcrumbs, 1 large room-temperature egg, and desired seasonings. Fold in the cooled caramelized onions and 1 cup of shredded cheese until just combined.

Preheat your oven to 375°F (190°C) and shape the mixture into a loaf. Place in a greased baking dish or onto a parchment-lined baking sheet.

Cover the meatloaf with aluminum foil and bake for 50-60 minutes, checking for an internal temperature of 160°F (70°C). Remove foil during the last 10-15 minutes of baking.

Once baked, let the meatloaf rest for 10 minutes before slicing. Serve with creamy mashed potatoes or a crisp green salad.