Knead the mince with the onions, a little grated cheese, 1 egg, savory and black pepper.
Peel and boil the potatoes. Mash them to puree with a little salt, oil, black pepper, crumbled feta and 1 egg.
Spread out 1/2 of the mashed potatoes in an oiled tray, spread on the mince on top and the remaining mashed potatoes on top of it.
Put to bake in a moderate oven until the mashed potatoes turn golden. Take the dish out, sprinkle grated cheese and finish baking.