
Crack and beat eggs with water in a small bowl.
Heat oil or butter over medium heat in a large non-stick skillet. Pour in egg mixture. As eggs set around the edge of the skillet, with spatula, gently push cooked portions toward the center of the skillet. Tilt and rotate skillet to allow uncooked egg to flow into empty spaces.
When eggs are almost set, add filling to half of the omelette, place a spatula under the un-filled half and fold over.