Heat a large frying pan over medium-high heat. Add the 1 kg minced meat with salt and pepper, breaking it apart as it cooks for 8-10 minutes until crumbly.
While the meat cooks, cut the hamburger buns (or hot dog buns) in half lengthwise and place the bun bottoms in a baking dish.
Add the diced onions to the meat and fry for 5 minutes.
Spread the minced meat mixture on top of the bun bottoms.
Top with the 10 slices of cheddar cheese.
Place the bun tops on each piece.
Preheat oven to 180 °C (350 °F) with conventional heat (top and bottom elements).