On 2008-12-02, sf > wrote:
> On Mon, 01 Dec 2008 14:01:57 -0600, "Pete C." >
> wrote:
>
>>Not sure if it's technically correct, but I've always heard it as
>>"Scalloped" was just a cream sauce (and often ham bits) and "au Gratin"
>>was with a cheese sauce.
>
> that's the way I separate them, Pete.

First recipe from a google search of scalloped potates:

http://tinyurl.com/ygj3st

.....and many more similar recipes with cheese. I doubt it makes much
difference, as one can add/subtract whatever one pleases and it would still
be essentially the same dish, sliced potatoes baked/broiled in a velouté
sauce.

nb