@Alice
Back in the day we made our popcorn the old fashioned way, shaking a JiffyPop pan over the stove top burner. On an adjacent burner was a small pot for melting the butter*, for pouring over the popped corn as the last step. I suspect this “butter flavoring” comes out cold, which is just not right.

* AKA oleomargarine, which was touted at the time as better for you than butter, but of course that was a lie.