Preheat the oven to 375 degrees.
Peel the potatoes, chop them, and add them to a pot of water. Bring to a boil until the potatoes are soft.
Drain the potatoes. Add cream and cheddar to the pot and use an electric mixer to whip the potatoes.
In a skillet add the olive oil and brown the onion, scallion, and garlic. Cook for 3 minutes.
Add the meat and cook until the meat is browned.
While the meat is cooking, add the ingredients for the sauce in a bowl. Pour onto the cooking meat and simmer for 10 minutes.
Add the mashed potatoes to the springform pan. Press it up against the sides to make an indentation for the meat.
Spoon in the meat mixture onto the potato crust.
Bake for 25 minutes until the meat is bubbly.