Peel the potatoes and cook them until they are soft enough to eat but still firm enough to slice without falling apart. My preferred method is to boil them and test with a fork until they are just right. You can bake them or even microwave them if you like.
Preheat the oven to 375 Deg after the potatoes are cooked.
Combine the spices, including salt and pepper, in a small bowl. Melt the butter in another small bowl and then coat the bottom of a baking dish with some of the butter. The size of the baking dish should be approximately 13 x 9. Smaller or larger baking dishes will just result in more or less layers.
Slice the potatoes into 1/4 inch thick rounds and form a single layer on the bottom of the baking dish. Brush the top of the layer of potatoes with butter and then sprinkle with the ranch seasoning mix (approx 1 tsp per layer).
Continue adding layers of potatoes, brushing with butter, and sprinkling with seasoning until all the potatoes are gone. Ours worked out to 4 layers. When you are done adding layers, top with the shredded cheese.
Bake for 15-20 min at 375 Deg or until the cheese is melted and/or browned to your satisfaction.
Serve as a side dish or see notes for other options.