Now, take a kadhai or any other cooking pot and put some oil. Let the oil heat until it smokes.
To the oil add the grated ginger, finely chopped garlic, and the green chilis.
Stir for a minute and then add the mashed potatoes. Keep the flame on medium.
Combine everything really well and keep on stirring.
After about a minute, add in the cumin powder, red chili powder, and turmeric powder.
Mix well and keep on stirring consistently. Scrape from all sides and below so that the mashed potato does not stick to the kadhai.
Add salt to taste. Mix again.
Keep on mixing the elements until a doughy consistency is reached.
Take a taste test. If the taste is fine, then add in the chopped coriander leaves (this is optional).
Combine the potato filling for two minutes more. Transfer this to a plate and keep it aside. Let it cool down for a few minutes.