Smash the potato, add the onions,chat masala and salt and mix well. Keep aside
Beat an egg and keep aside
Take the Bun and with the help of the knife make a circle on the top and remove the inner part of it. Press the corners and the base carefully. It should look like a pot from inside
Heat 2 tbsp oil and allow it to heat
From the smashed potato mixture make a lemon sized ball, flatten it carefully and coat it wil the beaten egg. Shallow fry it on a pan. Once done remove it on a tissue paper.
Prepare an omelette with the remaining egg or if required beat another egg.
Assembling the Bun :
Add a tsp of mayo to the Bun then add a tsp of cheese over it place a piece of fried egg. Place the fried patty and give it a slight press. Place a piece of fried egg and add a slice of capsicum and cover the Bun .
Prepare the remaining buns in the same way.
Final touch : toast the buns on both the sides and serve hot with tomato sauce.