In Finland they make many potato casseroles. Some of the most famous are Liver Casserole and Rutabaga Casserole.
Liver casserole is made much like regular scalloped potatoes, except you bake the sliced potatoes and onions in pureed fresh liver, either ground or in the blender, supplemented with milk or cream. It is available in groceries and delis.
Rutabaga casserole is equal amounts of boiled rutabagas and potatoes, mashed, dotted with butter and cream and baked again for sweetness.
Janson's Temptation is matchstick-sliced potatoes layered with chopped onions and anchovies and baked in milk.
My family makes special rye bread with raisins, caraway, and mashed potatoes in it for Christmas season.
Here in the USA commercial 'potato bread' often has no potatoes in it at all
When making fried potatoes I like to bake them first in the microwave, then peel. They are especially good at absorbing bacon grease that way.
There is a British dish called Colcannon which is very tasty. You boil potatoes, mash them, mix with chopped cabbage and bake it all together. When I was in Netherlands we ate a similar thing called 'kale-potatoes' where when the potatoes were almost done boiling, add chopped kale until it is tender, then drain and mash it all together with butter and milk.