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- Heat the butter in a frying pan, add the onion and cook over low heat for 5 minutes, or until it is soft and translucent.
- Preheat the oven to 160°C (315°F/Gas 3). Grease the base and sides of a deep 1 litre (4 cup) ovenproof dish. Layer in the potato slices with the onion and cheese (reserving 2 tablespoons of cheese for the top). Whisk together the cream and milk, and season with salt and freshly ground black pepper. Slowly pour over the potato, then sprinkle on the remaining cheese.
- Bake for 50–60 minutes, or until golden brown and the potato is very soft. Leave for 10 minutes before serving.
Variation: Try combining potato and orange sweet potato, layering alternately. For extra flavour, add some chopped fresh herbs.