Heat gas or charcoal grill. In small bowl, mix brown sugar and onion powder. Stir in beer, mustard, oil and soy sauce until well blended.
When grill is heated, place pork chops on gas grill over medium heat or on charcoal grill over medium coals; cover grill. Cook 10 to 15 minutes, turning and brushing once or twice with mustard mixture, until pork is slightly pink in center and thermometer inserted in center of pork reads 160°F.