Heat a small sauce pan on low to medium heat and add butter, onion powder, cayenne pepper, and smoked paprika (if you don’t like too much heat, use less cayenne pepper).
Stir the spices and butter together.
Continue stirring until the butter is completely melted (about 2 minutes).
Put the popped popcorn in separate serving dishes (or all of the popcorn in one big bowl).
Drizzle the smoked paprika and spice butter mixture over the popped popcorn.
Salt to taste, and sprinkle the juice of half a lime over each serving of popcorn.