Wash and slice firm potatoes. Peel and slice onion.
Lay them in an ovenproof dish, in layers or scattered, whatever.
Add salt and pepper.
Pour a mixture of milk and cream (and sueezed garlic) over it.
You may top it with crated cheese, but you needn't.
Bake covered in an 180 C. oven until almost done. Then some 10 minutes more uncovered for the golden finish.
Serve with a crispy green salad.