Preheat your oven to 375 degrees F.
Thoroughly wash and scrub potatoes. Pierce potatoes with a fork. Wrap each potato tightly with foil.
Place potatoes on a baking sheet and bake for 1 hour and 25 minutes, or until tender and easily pierced with a fork (check after 1 hour - time will depend upon size of potatoes).
Carefully remove potatoes from foil, place in a large bowl and coarsely chop potatoes with a knife (skin included).
Add butter, salt, and pepper. Stir with a large spoon until butter is melted.
Add sour cream. Stir well to combine.
Add mushrooms, green onions and bacon pieces. Stir well.
Add shredded cheeses last and stir well to combine.
Transfer to a 2 quart baking dish, cover with aluminum foil and bake for 15 minutes, or until completely heated and cheese is melted.
Sprinkle evenly with paprika.