This is almost exactly how I have made my au gratins all my life. I agree with the previous comment, there is a difference between au gratin and scalloped potatoes. If there is cheese in them, they are au gratin, with plain white sauce they are scalloped. I use red potatoes, sometimes precooked first. I chop the onions small, and never layer, always mix the cheese sauce completely with the potatoes and onions before baking it.
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