Twice Baked Potato Casserole

6 medium potatoes, baked
1/2 teaspoon salt
1/4 teaspoon pepper
1 lb bacon, cooked and drained
3 cups sour cream
2 cups shredded mozzarella cheese
2 cups shredded cheddar cheese
2 green onions, chopped
Cut peeled potatoes in 1 inch cubes.
Place half in greased 13x9 baking dish.
Sprinkle with half the salt, pepper, and bacon.
Top with half the sour cream and cheeses.
Repeat layers.
Bake, uncovered at 350* for 25 minutes.
Sprinkle with onions.