I only have a microwave to work with and what I've done is used a variation of this. I use the Glad Simply Cooking bags. They specifically made to steam things in the microwave and they also include instructions on cooking eggs in their bags.

I just follow the Baggy Omelet recipe and then cook in the microwave at 50% for about 6 minutes. You'll probably have to adjust the cooking time since my microwave is only 550 watts. But I've found that the 50% power setting cooks the eggs without making them rubbery.

My favorite omelet is 2 large eggs, a handful of chopped green pepper and a handful of fresh sliced mushrooms as well as some mozzerella cheese.

You don't even have to mix the eggs before putting them in the bag. Just throw everything in and zip it up and shake it real good before you nuke it.