Hi Minnie824
Well. I can tell you how I make an omelette here in the UK, I would imagine it's pretty much the same.
This is a very tried and tested way and they come out perfect every time.
Break 3 eggs into a glass bowl and beat. Not really beat like you would for scrambled eggs, just lightly beat to break the yoke into the white and mix it up.
Take your omelette pan and melt a knob of butter - about 1 ounze until it is completely melted but not browned.
Now.........add about 2 tablespoons of cold water to your egg mix - NOT MILK - and then, swirl the butter round the frying pan (I think you call these skillets?) until all the surface is coated with the butter, then pour the excess into the egg mix. Give the egg mix one final mix and then pour into the pan.
Whilst the pan is over the heat, the egg is setting on the base, draw the egg in from the edge to the centre of the pan, all the while moving round the pan. Once it starts to set, add your chopped mushrooms, cheese, tomatoes or whatever you have and then when the bottom has set completely, flip half over the make the half moon shape and just pop it in the pan - under the grill to brown.
Now I have been making omelettes like this for 26 years for my family - and they are one of the things they love the most. It sounds long winded but believe me, it only takes minutes and they are delicious.
Let me know if you try this way
