Adding Ham. If you’d like, you can add cheese to the sauce (making this more like a Potatoes Au Gratin). This sauce starts with a roux. You know the type. Ham and scalloped potatoes seem to be something I remember eating growing up, but the potatoes were in a box. Scalloped potatoes, or often called au gratin. Old Fashion Scalloped Potatoes That box that says scalloped potatoes on top, and you add milk, butter and put in the oven? The potatoes should be thin and evenly sliced. You can easily make this Scalloped Potatoes with Ham. 1. Use about 3 cups of diced or sliced ham. And of course these scalloped potatoes also have ham. Scalloped potatoes are very similar to au gratin potatoes. Potato Recipes. I used a mandolin to get perfect sliced potatoes. I don’t know what it is, but it’s the perfect balance, like a peanut butter and jelly sandwich. That will be about ¾ to 1 pound of ham. Just mix some well-trimmed ham in with the potato slices. You could say they are cousins – scalloped potatoes often have cheese added to the dish. Old Fashion Scalloped Potatoes and Ham. Making a roux is not difficult (it just means a mixture of fat and flour) and produces a creamy white sauce. But use more or less for your taste. Start by making an easy white sauce. Scalloped ham and potatoes is an easy main dish, there are two easy steps involved. Slice the potatoes.