In a large bowl, combine the cheese, cream, butter, garlic powder, onion powder, black pepper, and cayenne pepper. Mix until everything is well blended.
In a 9x13 inch baking dish, layer the potatoes in an even layer. Pour the cheese mixture over the potatoes and spread evenly.
Bake for 45 minutes, or until the potatoes are tender and the cheese is melted and bubbly.
Sprinkle with parsley and serve.
Interesting Facts
Au gratin potatoes are a classic French dish.
The name au gratin comes from the French word "gratter" which means "to grate".
Au gratin potatoes can be served as a side dish or as a main course.