While the popcorn is popping, grate the cheese into a small bowl. Add the chipotle powder and give it a quick toss until the cheese is coated in the chipotle powder.
Pour the popcorn into a medium bowl, sprinkle the Parmesan mixture over it, and toss until coated. Serve immediately.
Notes
Chipotle powder is spicy. If you're not a spice fan I suggest using paprika instead.