6th layer: cover the entire salad with mayonnaise or Miracle Whip so that the salad is entirely covered, with no ingredients showing (this will keep the lettuce very crisp).
Refrigerate overnight.
7th layer: bacon bits and shredded cheddar cheese are added immediately before serving.
Stir ingredients and serve.
Notes
The original recipe calls for using a 1 quart jar of mayo or salad dressing (Miracle Whip), but I've found that to be a bit too much.