Prep your grill and heat it to a medium high. Brush the oil on each of the corn ears and place on the grates. Rotate every few minutes until the kernels feel soft, about 10 minutes.
Meanwhile, place a pot over the heat on the grates. Add your stick of butter to melt. Stir in brown sugar, chili flakes, salt and bourbon. Bring to a simmer and cook for 5 to 7 minutes. When corn is about two minutes from being done, brush each ear with the butter.
Remove the corn and butter from the heat. Plate up the corn with more butter, feta cheese, flakey salt, chili flakes and cilantro. Enjoy!