I like it with parmesan cheese. Also, the sell these little tubs of popcorn seasoning at the movie theater near me that I always buy to use on my at home popcorn (they have Caramel, Kettle Corn, and White Cheddar flavors).
Whatever you do, don't burn it. That horrible stench makes me want to puke. I'm so close to putting in a complaint about people here at work who burn their popcorn.
Re: microwave popcorn - how to jazz it up?
Ranch dressing mix - the powdery stuff.
You don't need much though! A little goes a long way
It kinda makes your breath smell though...