Preheat oven to 400?F. Lightly grease a 9/13 inch baking pan.

Place the potatoes in the baking pan. Season with season salt, salt, and black pepper. Evenly distribute the butter over the potatoes.

Cover baking pan with aluminum foil and bake 1 hour in the preheated oven or until potatoes are tender. Remove from oven, and mix in the cheese and ranch dressing. Place back in the oven for 10 minutes or until the cheese it melted.