In my mind, egg whites exist only as a delivery system for egg yolks. Though they are a great source of protein, whites have almost no flavour, which is why I’ve never understood those people who add more of them to their scramble. (I don’t understand athletes, is what I’m saying.) Yolks should be the star of any egg dish, even scrambles.
For the most custardy, creamy, flavourful scramble — that comes together in mere minutes — you need to increase your yolk content.