Put flour, little salt, oil and in a mixing bowl. Mix it with your hand very well for a minute.
Then add little by little water and mix it. Make a soft dough. Knead the dough for 5 minutes and cover with a damp cloth / bowl for 30 minutes.
In another bowl add onion slices, chopped green chilies, lemon juice and chaat masala. Mix well and let it rest for 15 minutes.
Now take a lemon size portion from the dough in your palm. Roll it like a ball. With the help of some dry flour flatten it to a semi thin disc.
Heat a tawa / frying pan for 2 minutes.
Place the paratha in the hot tawa for 30 seconds.
Turn the side and give it another 30 seconds.
Now add 2 Tablespoons of oil from sides of the paratha.
Crack open an egg, sprinkle pinch of salt and pepper.
Then with a round laddle spread the egg all over the paratha. Then flip it to the other side and fry for a minute.
I mentioned 3 eggs because you can make 3 rolls out of the ingredients.
Now as a filling first spread some of the onion and green chilies mixture then some cucumber and coriander leaves, lastly add 1 Tablespoon of each 2 sauces.
Roll the paratha tightly and secure one side with rectangular piece of paper.