Boil potatoes in salted water till they are just done (don't over cook ,they should be al dente)
Let them cool down completely.
Chop into medium thick slices (No need to peel them)
Heat oil in a heavy bottom pan.
Add turmeric and the potato slices and cook on medium flame for about 1.5 minute.
Turn the side and cook again for about 2 minutes or till they get cooked completely and become little golden in colour.
Now add salt,chili flakes and oregano and mix gently.
Stir fry for few seconds and then serve hot.