Break the egg(s) into a bowl.
For each egg, add 1 Tablespoon tap water (not hot water).
Whisk or beat with a fork until thoroughly blended.
Put a bit of butter into a pan, and put it on medium heat on the stovetop.
When the butter starts to bubble, swirl the pan to coat the bottom of it, and then pour in the eggs.
Allow the eggs to sit for 1-2 minutes, and then stir with a wooden spoon until done as desired. It is best not to cook them until they are totally dry, since the more dry they are, the less fluffy and tender then will be.
Salt and pepper are added at the end. Pepper can go bitter if added before cooking.
If you wish to add other ingredients (minced onion or mushrooms or parsley), saute the ahead (except right at the end) and add them into the cooking eggs about halfway through.
Although usually I make an omelet if I want to add other things.