Light coals or start grill. Peel back the husk of each ear of corn and remove the silk. Do not strip off the husks. In a food processor, process the butter, garlic, basil, cumin, pepper, and chile powder until mixed well. Spread some of this mixture on each ear of corn. Bring the husks up around the corn. Place the corn on the edge of the hottest part of the grill. Grill slowly for about 10 minutes. Be careful not to let the corn burn. Remove the husk and serve immediately.