[mojo114]

Parenting Magazine:
In microwaveable coffee cup:
2 eggs
2 Tablespoons milk
Coat mug w/cooking spray, add eggs and milk- beat
Microwave High 45 seconds- stir.
Microwave until eggs are almost set (30 seconds) or what you think.
Top with grated cheese, mix.

[Netizen]

I need to try that. Might use a microwavable bowl to make sure it doesn’t spill over.

[magslinger]

We just mix the cheese in with the eggs. Also diced ham or back bacon. A tablespoon of pimentos or chopped stuffed olives add flavor and a nice touch of color, too, if you like.

It may cook up over the rim like a souffle but I've not seen it spill over.