Preheat oven to 350.
Begin by washing potatoes and slicing into thin rounds (about ¼" thick).
Place potatoes in a pot filled with water and bring to a boil. Cook for 3-4 minutes. Drain and pat dry potatoes.
Place foil on a baking pan and spray with cooking spray. Place potatoes on pan. Brush lightly with melted butter.
Sprinkle on garlic salt, cheeses and crumbled bacon pieces.
Bake for 16-18 minutes and serve with sour cream.