Heat the oil in a 3-quart saucepan on medium heat.
After it starts to get hot, put the kernels in and cover.
Shake the pan around for a while on the burner.
Try to keep the lid slightly ajar to let the steam from the popcorn release.
Once the popping slows down, take off the heat and dump it into a bowl.
Add salt and nutritional yeast flakes and toss while the popcorn is warm.