Preheat the oven to 180°C/350°F/Gas Mark 4
Place the cream, milk and garlic in a large saucepan.
Heat to a gentle simmer.
Add the potatoes, cover and simmer for 10 minutes.
Cook until just tender.
Transfer to a buttered ovenproof dish.
Sprinkle over the cheese
Bake for 25 minutes or until golden.