Set a large Dutch-oven or large pot over medium-high heat, add the oil. Place 3 popcorn kernels in the oil. When the first kernel pops, add the remaining kernels and cover. Remove from the heat for 15-20 seconds, then return to the heat and shake every 1-2 minutes. After about 3-4 minutes all of the kernels should pop. Remove the lid and pour the popcorn into a large bowl.
In a small mixing bowl, combine the melted butter, garlic, salt, and pepper. Drizzle over the popcorn and stir to combine. Sprinkle in the parmesan cheese, tossing as you go. Enjoy immediately.
Notes
*Depending on how salty your parmesan is, you may not need to add any salt.