Preheat the oven to 350 degrees F (175 degrees C). Place popped popcorn in a large roasting pan.

Combine melted butter, paprika, lemon pepper, salt, garlic powder, onion powder, and cayenne pepper in a small bowl; pour over popcorn and stir until it is somewhat evenly coated.

Bake in the preheated oven for 15 minutes, stirring every 5 minutes. Remove from the oven and cool completely. Serve immediately, or store in an airtight container for later.