In small bowl, whisk together Parmesan, mayonnaise, vinegar, Worcestershire, mustard, garlic and pepper. Cover and refrigerate.
Cook unpeeled potatoes in boiling salted water until tender; drain and cool. Slice potatoes; place in large bowl.
Fry M&M Bacon until almost crisp; do not drain. Add to potatoes with onion, parsley and Parmesan mixture; toss to coat.
Season M&M Chicken if desired; barbecue according to package directions. Slice and combine with salad. Sprinkle with additional cheese, if desired.