Now at $mas we have rocket crumple and gulyás. Rocket crumple how we pronounced rakott krumpli, which is yummy:

Cold leftover sliced boiled potatoes, prettiest slices reserved
Cold sliced hard-boiled eggs
Kolbász or other spicy sausage, casings removed, sliced
Butter and lots of it
Sour cream ditto

Butter a deep baking dish. Bottom layer potatoes, dot (like a slice per tater) generously with butter, slather with sour cream, layer of egg, layer of sausage, another layer of potatoes. Push down hard and everywhere on potato layer. Add more butter and sour cream, repeat, not forgetting the pressing. Finish with top layer of the pretty potato slices, butter top generously. This dish takes more butter and sour cream than you'd think. Use smaller dish with more layers rather than bigger dish with fewer layers.
Bake at 350F for an hour at least, till top layer is a deep brown. When serving make sure you serve vertically, so each serving has some of the top crunchy taters and some of the bottom layer of taters that have soaked in the juices of sausage etc. The butter and sour cream cannot be stinted or no juice will form to carry the egg and sausage flavors through the potatoes. So, so delicious.
One sister makes a meatless version with mushrooms instead of the sausage. That is also good and some hot paprika around the mushroom layers gives the sauce some spice the way the kolbász does.
There is no edible vegan version. We have tried.
Heart attack on a plate, sure, but you'd die happy!