Preheat oven to 325°F. Cook potatoes in boiling salted water for 5-10 mins then drain and set aside.
Heat oil in a large saucepan and sauté salami. Add onions and peppers, briefly cook then add sauerkraut and cook for about 10 mins.
Add potatoes then transfer 1/2 mixture to a greased baking dish. Mix sour cream and eggs, season then pour 1/2 mixture over sauerkraut.
Top with another layer of sauerkraut and cream then top with feta and bake for 40-45 mins.