I love the sweetness of onions in omelette but have never thought of mozzarella. Did you put it under a grill or put it in cold?
Might be an idea for me to try that with a sort of Spanish tortilla ie perhaps with some potato added and red pepper covered with lots of fried onion with the cheese on top and grilled.
What do you reckon?
The wife makes a fine tortilla....fried onion, red pepper and pre made chips all go into the switched eggs. I did try adding some grated sardo cheese to the egg mixture once much to my wife's horror. However if you like cheesy scrambled egg you'll like it.
Not sure it would work with Mozzarella although it isn't my favourite cheese I have to say.