Put salt, nutritional yeast and cumin in dry container of your blender and grind until almost powdery.
Heat oil in a large saucepan or soup pot over medium-high heat. Add popcorn, and place the lid on the pan. Shake to coat kernels with oil. When the corn starts to pop, shake the pan constantly until the popping stops.
Remove from heat, and pour popped corn into a large bowl.
Drizzle the melted margarine over the corn if using, and sprinkle with yeast, chili powder, cumin and salt mix.
This is my famous snack and everyone loves it. This brings your popcorn traditions to a new level!