Put your Dutch oven or large pot over a medium low heat.
Once hot, add the butter.
Next, add the pickled jalapeños to the melted butter. Cook for 5 minutes, stirring often.
Pour in the popcorn kernels and add salt and pepper. Stir and spread the kernels in an even layer and cover.
Once the popcorn starts popping, lift the pot just slightly off the burner and shake back and forth to evenly distribute the heat.
Cook until the popping slows, be sure to shake the pan every 30 seconds. All together this should only take 3 to 5 minutes.
Toss popcorn with white cheddar powder, chopped cilantro, and sliced jalapeños, and serve immediately while still warm.
Notes
Don’t walk away: Stay near the Dutch oven so you can shake it regularly for even popping. Taste before salting: The cheddar powder and pickled jalapeños may already be salty enough. Add herbs last: Toss in the cilantro just before serving to keep it fresh and vibrant.