Oh, oh I was so new to that too! I just bought my first can yesterday, it took me FOREVER to find it. Because here apparently everyone calls it brewers yeast, and I didn't know. But, yeah, it is REALLY good for you and not at all expensive. I got a HUGE can for less than $10, it should last me a few months. Anyway, I used it for the first time today in a vegetable stir-fry, it is soooo good. It does have a cheesey flavor, and mine kind of turned into cheese because I poured a little water on the vegetables while I was cooking them and then put the nutritional yeast on top, and it came out really melty and yummy. I am in love, and it is my first time having it. I can imagine how good it will taste on scrambled tofu! Plus it is amazingly nutritious. 8 grams of protein in one of the little scoops it comes with! PLus an assortment of B vitamins and other things. And only 45 caloris per scoop!!! ( the scoop is 2 tblsp, but it is enough. At least on the veggies it was)
So, until yesterday I had no idea what it was...And I still don't even know what it really IS, lol, my mom keeps asking me and I don't know!
Edit: It's not brewer's yeast, but that's the section of the store mine was at. So, make sure it isn't brewer's yeast! The only brand the store had was KAL, and it comes in a big yellow can. It is grown on molasses and mine says "vegetarian support formula". Hope the helps!