Fire up your grill for cooking around 400 F. Depending on how much cedar flavor you want, you may want to char the cedar plank on both sides before adding the corn.
Combine the melted butter with your favorite seasoning.
Brush the corn with the butter mixture. Transfer to the plank. I like to stand the corn on end.
Cook for about 20 minutes or until just tender. Brush with more of the butter mixture every 5 minutes.