Firstly squeeze excess water from the grated potatoes.
Grate apples around the core, and transfer to a colander or strainer, pressing out as much liquid /juice as possible.
Coarsely grind the oats.
In a broad plate take potato, grated apple, roasted oats, add cheese, coriander, mint, green chillies, salt and corn flour and mix all ingredients very well.
Heat a non-stick pan and drizzle some olive oil.
Now take a spoonful of prepared mixture on to your greased palm and make a flat round shapes and keep aside.
Cook the rösties on a medium flame until golden brown and crisp on both sides, flipping them occasionally.
Do the plating and serve hot rösties with hot and sweet sauce or schezuan sauce.