In Philadelphia, In the early 1980s, Cheese Fries with Cheez Whiz first surfaced from a company called "Philly Fries" (founded in 1981). Scott Collins and his mother Vilma Collins created the dish as described in the Philadelphia Daily News in 1983.,
In Philadelphia, pizza fries are topped with melted mozzarella and served with pizza sauce on the side, while "Mega Fries" are topped with Cheddar (or sometimes Cheez Whiz) and mozzarella cheese and bacon. Usually served with a side of ranch dressing.
In other parts of the US, nacho cheese is often used, especially in snack-stand type settings.
In Ireland a popular variation called "Taco Fries" consists of fresh cut chips covered in sub sauce and shredded Cheddar. Piled on top of the cheese are ground beef, tomato, peppers, onions, and various seasoning.
In Bulgaria, a common side dish offered in most restaurants consists of French fries, topped with grated or crumbled sirene.
Fast food chain In-N-Out Burger serves "Animal Style Fries" which are covered in melted cheese, grilled onions, and Thousand Island dressing.
Some German "Imbisse" (fast food joints) serve a variation on chilli cheese fries with bolognese sauce instead of chilli.