Heat oven to 450°F. Line 15x10x1-inch pan with foil. Bake cottage fries as directed on bag.
Meanwhile, in small bowl, mix chicken, mayonnaise, garlic powder and chili powder.
Sprinkle 1 cup of the cheese evenly over hot cottage fries. Spoon chicken mixture evenly over cheese. Sprinkle with remaining cheese and the bacon.
Bake 3 to 5 minutes longer or until cheese is melted. Serve with sour cream and ketchup.