In a Pan: Add 1 Tbsp. of the oil to a large cast-iron skillet (or grill pan) over medium-high heat. Once hot, add corn and roll in oil; let cook, undisturbed for 4 minutes, until bottoms are lightly charred. Toss, and continue cooking in 2 minute intervals, until the corn is charred to your liking.
On the Grill: Preheat grill to medium-high heat. Brush corn cobs with oil, and grill for 10 to 12 minutes, turning occasionally, until kernels are lightly charred.
Over a Gas Range: Heat burner to medium-high heat. Lightly spray corn cobs with cooking spray, and place directly over flame for 6 to 8 minutes, turning to char all sides.