Preheat oven to 400°F. Line a baking sheet with aluminum foil.
Place corn on baking sheet. Reserve about 1/2 of the butter. Spread remaining butter on the whole ear of corn. Sprinkle liberally with salt and pepper (I use about 1 teaspoon of each).
Bake for 30-45 minutes, until starting to brown. Turn corn occasionally. Remove from oven and spread remaining butter over the top of the corn. Sprinkle with more pepper as desired.