Separate chicken wings at joints into 3 parts each, discarding tip.
Mix sherry, soy sauce, ginger, garlic powder and onion powder.
Combine chicken and sherry mixture in medium bowl or plastic bag.
Cover and refrigerate overnight, stirring once or twice during marinating time.
Arrange on double layer of paper towels around outer edge of turntable or on roasting rack.
Microwave at MEDIUM-HIGH (70%) until juices run clear, 18 to 22 minutes.