Break open 4 eggs in a container and beat it well

Add Salt to the beaten eggs and mix well

Slice a small onion and chop 3 medium Potatoes

Deep fry the Onions and Potatoes. The potatoes should be cooked well

Add the fried onions and potatoes in the egg mixture. Let it soak in the egg mixture while the pan is getting hot. (optional: You can smash the potatoes a little to blend in it egg mixture)

Heat a frying pan and add oil in it

When the oil in the pan is heated, add the egg mixture entirely with onions and potatoes. The pan should be small enough, to exactly hold the egg mixture

Fry the omelette on one side. Let it not burn

For frying the other side, keep a plate on top of the pan and flip the omelet on the plate

Now, slide the omelet back in the pan and cook the other side. Tuck in the corners of the omelet so that, you can get a thick fluffy omelette. 

Now your Omelette in ready. Garnish the Omelette with your favorite seasonings. I have added Chilli Flakes here.