I’ve got two go-to’s for movie theater style popcorn, both are plays on a sweet and savory - you can do with or without butter, the first one is better with, the second one is better without
1.) Salt, curry powder, cinnamon, and a *little* bit of sugar
2.) a box of either m&m‘s (regular or peanut) or Cookie Dough Bites, and a little bit of salt