Meanwhile, brown 1 pound ground beef (seasoned with seasoned salt, to taste) and sauté small onion (chopped) in a large skillet.
Add mashed potatoes, pressing firmly with spatula to ensure that ingredients don't fall off the side of the pan. Sprinkle with shredded cheese.
Bake at 400F for approximately 20 minutes (until cheese is melted and pie is hot throughout).