For the Filling:
To prepare the dough:
Mix maida, rava, milk, oil, salt & water & knead well to make a smooth dough (reserve 1 tablespoon of maida for sealing). Cover the dough with a wet cloth and set aside.
Mix the boiled potatoes, chopped onions, ginger, garlic, chili paste, red chili powder, turmeric, garam masala powder, cilantro & salt.
Mix the remaining maida with some water to make a paste.
Make lemon sized balls out of the dough. Roll into thin round chappathis. Keep some filling at one end of the chappathi and roll towards the other end. Seal the edges together using the maida paste. Prepare all the rolls in the same manner.
Heat oil in a pan and deep fry few rolls at a time until brown. Repeat this until all the rolls are fried. Serve hot with Tomato Ketchup.