In a mixing bowl, add all the spice powders along with salt and oil.
Mix well. Now add the potatoes and give a quick mix. Let it to marinade for 15mins atleast.
In a kadai, heat oil add mustard seeds and curry leaves, let it splutter. Then add the potatoes and saute for atleast 5-10 mins in low flame till its fried well. If it sticks add little oil and keep sauteing.