Many people use sausage in it, but I have an aversion to it as my dad let me think our pigs were pets like the cats, dogs, chickens and horse and one morning they were in the breakfast gravy. It traumatized my little 5 year old self, lol.

https://www.centercutcook.com/breakfast-gravy/

You can add bacon or anything else, or nothing as I usually do when I have it. I know, bacon comes from the same animal, but it was sausage in that gravy and they let me eat it before my older sister began teasing me with the knowledge of its origin.