In Australia you can buy popcorn salt, but its butter flavoured. In the USA, what do YOU guys call popcorn salt? Is it just a really finely ground powdered salt? Or does it have additional flavouring added?

Thanks in advance.

Here it is just super fine salt. No flavorings to speak of. Have you used the butter flavored?

ANot in my icings or butter creams. Just my popcorn!

Thank you for clarifying, though. I can always use my mortar and pestle to make a powdered salt if need be for my buttercream.

You're welcome. Unless you were going for popcorn flavor I guess it wouldn't be the right thing to add. Always curious to try things like that though. 

if you can't get the unflavored popcorn salt, you can take regular salt and put it in a food processor or mortar and pestle to grind it superfine.

Or just dissolve it in whatever liquid you use.  If I don't have popcorn salt, I'll just use regular table salt and add it to my butter while it's creaming.