Lawry's seasoning salt. By itself or with the Brewer's Yeast. Also, at our local Walmart they have small shaker cans with popcorn toppings. You just shake them on. The cheddar and garlic is very good. Look next to the bags of regular popcorn-not microwave.
If you have a topping you like, but it doesn't distribute well, like parmesan, or herbs, put them in an electric coffee grinder and they will become dust. Perfect for popcorn!
Where do I find Brewer's yeast?? Ya'll got me curious and now I don't know where to look for it.
I have a bottle I got for the dog as a coat supplement but never bought it as a people thing.