Step 1

Preheat oven to 400˚F (200˚C) and grease a 9x13 inch (23x33 centimeter) baking dish with olive oil.

Step 2

In a large pan, drizzle the 2 tablespoons (30 milliliters) olive oil over medium heat.

Step 3

Add onions and cook, stirring often, until lightly browned.

Step 4

Sir in the ground beef, breaking up with a spoon, and season with salt and pepper. Continue cooking and breaking apart the meat until browned. Remove from heat and set aside.

Step 5

Peel the potatoes and cut into 1/4 inch (6 millimeter) thick slices.

Step 6

Layer half of the sliced potatoes, about 2 layers, across the bottom of the prepared baking dish. Season with salt and pepper.

Step 7

Cover the potatoes carefully with the cooked ground meat in an even layer. Top with the remaining potatoes, another 2 layers.

Step 8

In a medium bowl, whisk together the eggs, sour cream or yogurt, milk, salt, and pepper.

Step 9

Pour evenly over the potatoes. Bake in the preheated oven until potatoes are tender and top is golden brown, about 45 minutes to 1 hour. Broil, if desired, to crisp the top further.

Step 10

Allow to sit for 10-20 minutes to settle before slicing and serving. If desired, sprinkle with a little chopped parsley.