Simmer the beans until just tender, drain and run them immediately under cold water. Pop them out of their skins.
Blanch the spinach and squeeze dry on kitchen towel.
Beat the eggs, then stir in beans, spinach, parsley and cheese and season to taste.
Oil a heavy based frying pan and cook the omelette to your liking.
(Recipe: The Fast Diet by Dr Michael Mosley and Mimi Spencer)