I love better than bouillon so much. It has the richest flavor of all the vegetable broths IMO. I have four jars in my cupboard.
I make my gravy the same way. I only have gravy twice a year, Thanksgiving and Christmas. I make a roux by sautéing onions and finely chopped celery then adding the flour and some nutritional yeast. Sometimes I’ll add mushrooms but only when I’m in the mood for them, which isn’t often. Then I add the broth.
One time I even added some shredded carrots. It was really good.