STEP 1
Preheat oven to 425°F.
STEP 2
In a large skillet, cook the ground beef and onion together until the meat is browned and the onion is tender. Set aside.
STEP 3
In a 10-inch pie plate, stir together the shredded potatoes, oil and salt. Press evenly into pie plate to form a crust. Bake until slightly browned, about 15 minutes. Remove from the oven.
STEP 4
Lay the cheese slices on top of the crust (or sprinkle evenly with the grated cheese), then top with the ground beef-onion mixture.
STEP 5
Beat the milk and eggs together in a bowl and pour mixture into the pie pan. Sprinkle with the parsley. Return to the oven and bake until browned and a knife inserted in the center comes out clean, about 30 minutes. Cool 5 minutes before serving.