In a medium bowl, whisk eggs and salt until fully combined.
In a nonstick pan, over low heat, melt butter.
When butter is melted, pour eggs. Using a rubber spatula, constantly scrape the bottom of the pan while shaking the pan in a circular motion, to ensure that the eggs cook slowly. Stop stirring as soon as eggs are very softly scrambled and creamy. About 1-2 minutes.
Turn the heat off, tilt skillet up by its handle, gently roll the omelette down over itself. Invert onto a plate, brush the omelette with butter, then sprinkle with chives.
Serve immediately.
Notes:It is important to use the right size pan.Best eggs to pan ratio: 2 eggs: 17-18cm (6-7 inches) pan3 eggs: 20cm (8-inches) pan4 eggs: 23-24 cm (9- inch) pan