Barefoot Contessa (en-US)

From the cookbook:

Cooking for Jeffrey

1 bag microwave popcorn, such as Newman’s Own Natural
4 tablespoons (½ stick) unsalted butter, melted
½ cup finely grated Italian Parmesan cheese
½ teaspoon chipotle chile powder
2 teaspoons fleur de sel

Microwave the popcorn for 3 to 5 minutes, according to the directions on the package, until the popcorn stops popping. Carefully pour the hot popcorn into a large bowl and immediately pour on the butter, then the Parmesan, chile powder, and salt. Toss well and serve hot.

Parmesan & Chipotle Popcorn