My mother is from Switzerland and this is a dish she used to make ALL the time, but it is not calorie-friendly NOR is it cholesterol-friendly, but it is so good - Comfort Food. This is exactly how my Grandmother makes it, but I have played with this recipe many times. You can add cooked ground beef to the layers, sautéed chicken. I've added chopped ham. Stay away from anything with liquid like tomatoes, zucchini or mushrooms; for some reason they are too watery for the dish and leave a yucky pool of liquid in the bottom of the dish. The potatoes won't absorb the liquid. I've also played with cheese combination. So far, Swiss and Colby work well together (I grate the two together and toss them together) and so does cheddar and fresh parmesan. Good luck and have fun with this recipe.