Note that you could customise your egg muffins as you wish. You could add in some corned beef, boiled and diced Irish potatoes or even some cheese. The more ingredients you add, the more muffins you will make so if you add a lot of veggies, 6 eggs will give you 8-10 muffins.
Also, this is a great make-ahead breakfast. You could save it in the fridge and simply reheat for a quick breakfast on busy mornings.