Use your hands to mix everything together, then transfer beef mixture to a pie dish and press it into the bottom and up the sides of the dish.
Fill beef “crust” with mashed potatoes and smooth out the top with the back of your spoon. Top with cheddar cheese and place in oven.
Bake for 40-45 minutes, or until cheese is melted and meat registers an internal temperature of 160º F. (Note: if cheese is melting too quickly, cover with aluminum foil.)
Remove from oven, garnish with bacon, tomato and green onions, and serve hot.
Recipe adapted from Betty Crocker