Preheat oven to 350 degrees. Grease a 13 x 9-inch baking dish; set aside.
Cut baked potatoes into 1-inch cubes. Place half of the potatoes into the prepared baking dish. Season with salt and pepper. Sprinkle with half of the crumbled bacon. Top with half of the sour cream and cheeses. Repeat layers.
Bake, uncovered for 20-25 minutes or until cheeses are melted. Sprinkle with green onions and serve.