Using a medium sized casserole dish put a layer of potatoes then sprinkle with some of the onion, cheese, salt and pepper. Repeat the layers until you've used all the ingredients - finish with a layer of cheese.Pour the cream or milk over it evenly. I think it tastes best with cream, but it all depends if your on a diet or not.Bake at 180 C for...

Serve this delicious sweet potato casserole at your next holiday get together.

Gratin adapted from French cuisine is a type of casserole dish that is covered with Béchamel sauce or Mornay sauce, topped with buttered breadcrumbs or grated cheese and either baked or broiled, then served in its baking dish with a golden crust. Cooking au gratin is a technique rather than exclusively a preparation of potatoes (which is specifically a gratin dauphinois): anything that can be sliced thin, layered with a cream sauce and baked is material for a gratin: fennel, leeks, crabmeat, celeriac, aubergines.