Great question — answering as the UphillTech team:
If you want it fluffy, you'll need air. The easiest way to accomplish this is to crack the eggs in a bowl, whip them (with a whisk or a fork) for a couple of minutes. If you have a homogeneous-ish substance, add them to the onions and potatoes in your pan.
Full answer by Mien: https://cooking.stackexchange.com/a/13369 (CC BY-SA 2.5).
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