Holding head of lettuce firmly together, slice across the head every 1/2 inch to get nice slices of lettuce. Stop when you get to the tough bottom part. Discard bottom and put sliced lettuce in large bowl.
Toss with diced or shredded turkey.
Add dressing and toss well to coat.
Sprinkle with croutons or toasted dressing bits and cranberries, if desired. Toss again.
Add cheese, if desired.
Taste for seasoning and add salt and pepper if desired. Serve immediately.