As a vegetarian option for parmesan, consider combining it with cracked pepper to create a great Cacio e Pepe-style popcorn seasoning. Though caramel popcorn is a popular treat in its own right ...

This can be oil, butter, ghee, or even a homemade caramel drizzle. The point is to enhance the stickiness of your popcorn evenly so your seasonings will grab hold and not be shaken back off.