Recent studies have shown that the same cancer-causing stuff that's in Teflon is also in microwave popcorn bags. Far better to make your own (the easy way). I used Alton Brown's recipe for general ingredient ratios.
1/3 cup organic popcorn kernels
2 tsp olive oil
1 brown paper lunchbag
1 staple
To taste:
salt
sugar (optional)
Tobasco sauce (optional)
nutritional yeast (optional)
Pour the corn kernels into the paper bag. Mix the oil, salt, sugar, Tobasco and nutritional yeast in a measuring cup, then pour the mixture over the corn and shake to mix. Fold the bag over, and close with a staple (no more, or it will spark in the microwave). Place in the microwave, and cook for 2-3 minutes, or until the pops are more than a few seconds apart.
Ingredient Notes: I got my popcorn kernels at New City Market, where you can even buy them in a paper bag. They also carry nutritional yeast powder, which provides a 'cheesy' taste and loads of vitamin B12.