Plug in your air popper and position a large bowl in front of it to catch your popcorn.
Following the manufacturer's instructions for your air-popper, add your kernels and pop your popcorn. While it pops, get your salt and oil ready.
As soon as it finishes popping, immediately drizzle with one-third of the oil (2 tsp) and 1/3 of the salt (1/3 of a tsp) and toss it with your hands to distribute the oil. Repeat two more times and taste. Add more salt or oil if desired. (SEE NOTES)
After seasoning, serve immediately or store in an airtight container, like a glass jar or resealable bag, for up to 2 weeks.
Notes
Once the popcorn is popped, you'll need to season it right away. Waiting any longer than a minute or two will result in stale-tasting popcorn.
The key to distributing your seasoning evenly is to add only 1/3 of the oil and salt at a time, and tossing/mixing it with your hands between each application.
To ensure an even distribution of oil, use an oil decanter with a narrow spout. Drizzle over the top of the popcorn in a back-and-forth motion for a count of 3 to 4 seconds each time. Otherwise, measure your oil onto a spoon and lightly drizzle using the same back-and-forth motion.