Melt a small knob of butter in a 22cm frying pan and cover the base of the pan.
When it just starts to brown add your eggs.
For the first thirty seconds let it set and then bring the egg from the edge of the pan into the middle and stir.
Then add your filling of chopped greens, feta cheese and fresh herbs.
Fold the omelette over either in half or into a roll and serve. Season with a pinch of salt and pepper and garnish more fresh herbs and some watercress or rocket.