I use an air popper, alot. and my go to corn is yellow jolly time. Mostly butter and salt but a few weeks ago I made "sour cream and onion"...
added a couple tbls of instant milk, some onion salt, some dried dill, and a couple tbls of parmesian cheese to the butter, made it kind of thick, and I need to figure out how to make it more sticky, but the flavor was good.