French Fry Casserole - Mix cream soup, sour cream, and shredded cheddar with french fries. Bake 350° for 30 minutes or so. My upgrades: Add canned chili and use bacon pieces, lil' smokies, or sliced hot dogs in place of ham for the meat.
Cheeseburger and Fries Casserole - definitely a kid pleaser. It is so easy to throw together. I try to use smaller fries like shoestring so they brown faster. I've used tater tots in a pinch and we like that version just as much. I don't add any salt either.