Cook the potatoes and cut in thin slices.
Cut the onion and bacon in small pieces.
Start the oven at 200 degrees Celsius.
Place the potatoes in an oven form, sprinkle the bacon and onion on top.
Cut the cheese in half, try not to touch the cheese with the fingers otherwise your fingers will smell for days. Place the cheese on top of the potatoes.
Place in the middle of the oven for 30 minutes. Take out and serve warm.