Break eggs into a bowl, add salt, pepper and herbs - important as it won’t taste of much without , use fresh herbs ideally. break up eggs with fork and sort of mix but DONT make into homogeneous blend or whisk. You should see white and yolk separately. Otherwise you’re steeering to scrambled eggs.
I then add about 1 desert spoon of cold water and lightly mix in- this turns to steam on contact with very hot pan and creates lighter texture - learntvthis trick years ago
Prep your filling if using- this may mean cooking mushrooms first in pan etc. have the fillings ready to hand
Only when ready to serve and everyone at table or whatever,
heat heavy bottom frying pan over the heat at max until it is searingly hot. you should feel heat on your hand form around 30 cm away,
add a good knob of butter- it should sizzle and melt immedately- swirl very quickly to grease pan base
pour in eggs and using a fork, immedately bring the cooked egg into middle, tipping unset eggs to edges until it is all partially set - it literally takes 1 or2 mins
the top should NOT be set.
tip over your filling and make sure dispersed well
DO NOT flip the omelette- it should be soft inside- it’s not a flipping pancake . You cook one side only.
using a palette knife and your serving plate, tilt the pan over the plate, flip one edge over, and allow omelette to roll over itself and out onto plate
best omelettes are where egg in centre is just cooked, but runny and not quite set, but the intense heat has browned the outside . You need a very hot pan to do that.
The original fast food - takes 3-4 mins to get 2 out and on table, if you’ve got fillings ready first.