In a 1-1/2-qt. microwave-safe bowl, heat cream cheese, uncovered, on high for 45 seconds. Stir in the sour cream, milk, mayonnaise and Worcestershire sauce. Add the kielbasa, 1/4 cup of onions and Parmesan cheese; mix well. Microwave, uncovered, on high for 2-3 minutes or until heated through, stirring once. Sprinkle with remaining onions. Serve with crackers or vegetables. Store in the refrigerator.