The cheese omelette is indeed a thing of beauty. My preference is to grate parmesan generously on to the unset top side, then fold in half for a few seconds. Always in a very hot pan, always cooked in butter. An omelette that is completely set in the middle is very disappointing. My dad used to cook his "omelettes" to death on both sides, no folding. You could sole your shoes with 'em.