Arrange an even layer of potatoes to cover the bottom of the pan, slightly overlapping the slices. Sprinkle with salt and pepper and a layer of onions and cheese. Repeat with 2 more layers ending with potatoes. Top with salt and pepper.
Cover the pan with a lid or foil and cook on the stovetop over medium heat for 30 minutes.
Preheat the broiler, then broil until the top is browned.
Keyword British, Cheese, Easy, Family Meals and Snacks, Potatoes, Side Dishes, Vegetarian