Quick flavour for fresh popcorn
I worked at a movie theater for a few years in high school. We cooked popcorn in coconut oil and applied Popcorn Salt (the kind that includes artificial flavorings in addition to the salt) during cooking and at time of serving per customer's request.

For application after cooking we stocked many flavors of a brand of popcorn seasoning known as "Kernel Seasons." Those flavorings range from the expected cheddar and french onion to the stranger marshmallow and caramel.



These flavorings were fun every once in a while but most of them had strong chemical aftertastes. It's quick and easy to apply. Kids have a blast with it. People who object to artificial flavors will not enjoy it though.

You could try something like a powdered ranch dressing mix or some other spice mix for similar results.

The key is adding some salt during the cooking process. It sticks much better that way. Any additional seasoning should be added as quickly as possible after popping while the corn is still "wet" with oil on the surface, again for stickiness.