Fill a 1-gallon pot half full with water and bring to a boil over high heat. Add corn and boil for 7 minutes or until kernels are tender. Drain corn.

In a small bowl, combine melted margarine and garlic salt. Using a pastry brush, coat corn with margarine mixture.

Place in serving dish and lay 1/2 slice of cheese over each ear of corn. Allow to stand for 5 minutes before serving so that cheese melts.