Yep, sounds like the MIL added too much milk???
I do add, as others have said, 'a splash', of milk or water.
And, I am generous with the salt.
While the eggs do not have to be over-beaten into a smooth batter, (which I think is another mistake that some make that will change the texture of the scrambled eggs) they do have to be well-beaten with a little froth...
Do NOT over-work or over-cook eggs!!!
I use some vegetable or olive oil.
Butter burns at a lower temperature and result in those brown encrusted eggs.
Just the thought of bacon grease sounds so heavy and unhealthy to me.
Use the spatula to rake in from the sides of the pan as they begin to solidify...
Turn off the burner once the pan gets hot enough to cook/solidify the eggs.
I do turn mine when they start to get done, as I do like them fully cooked... but NOT OVERCOOKED OR BROWN!!!
Mine come out really good most of the time.
My DH likes his eggs, and when he started cooking them for himself, they came out as over-cooked shards of rubber!!! Hahahaha!!!
To be fair, I will say that he has learned a lot and does much better!
He has actually become a very good sous chef for me!
(Just don't even want to talk about making boiled eggs...)