Heat the pan at medium heat and add oil, cumin seeds, fennel seeds, coriander powder, amchoor powder, chilly powder and chopped green chillies.
Mix all the spices and sauté them for few seconds. Now add boiled, peeled and roughly mashed potatoes. Mix everything and sauté for 5-6 minutes.
Add salt and garam masala powder. Transfer these potatoes in a bowl and let them cool completely. In a bowl mix together flour and water together and make a thick paste.
Now cut tortillas in half. Fold it in samosa shape and seal it with flour paste. Stuff potato filling inside and seal all the surfaces properly using flour paste.
Deep fry these samosas on medium heat turning occasionally till they become golden brown and crispy. Serve the samosas with coriander chutney or ketchup.