Take about a 1/4 cup of popcorn kernels and put them in a bowl. Drizzle a small amount of olive oil over them. Just enough to coat them when stirred, maybe about a teaspoon at most. Stir the popcorn to coat it in the olive oil.
Put the popcorn in a paper lunch bag and put some salt in if you would like. Making about half inch folds, fold the lunch bag over about three times.
Pop in the microwave on high for about 2 minutes. Microwaves vary so you need to listen and when the popcorn starts slowing down, take it out. Ours takes less than 2 minutes. I just set it for 2 minutes and then listen for when to stop it. Don't let it go too long or it burns. After a time or two you'll know how long and when to take it out.
Pour it in a bowl and it's ready. It's pretty dry like this. I've gotten to where I like it dry. But you could add butter or seasonings to it. This way you know exactly what you're adding and how much. Good idea, especially if you're watching calories. Or even if you're just trying to be more aware of what you're eating. It has about half the calories and fat as boxed microwave popcorn.