Beat the eggs and milk, season. Heat the butter in a non-stick frying pan. Pour ¼ of the egg mixture into the pan, cook over a medium heat for approx. 3 mins. until the omelette is firm at the edges. Loosen the edges of the omelette from the pan using a spatula, continue cooking until the omelette is firm, turn over. Use the remaining egg mixture to make 3 more omelettes.