Place half of the lettuce in the bottom of a large bowl. Add a layer each of half of the peppers, mushrooms and celery.
Spread ½ cup (125 mL) mayonnaise over the celery. Layer remaining lettuce, peppers, mushrooms and celery.
Top with eggs, then spread remaining mayonnaise over eggs.
Sprinkle cheese over mayonnaise, then top with bacon bits, if using.
Refrigerate for 24 hours.
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